Add missing config docstrings (#15803)

## Summary

As promised in #15603 - the **highly** sophisticated change - adding
missing config docstrings that are used in command completions.

## Test Plan

I actually made a local change to emit all empty items and verified
there are none now, before opening the PR.

crates/ruff_workspace/src/options.rs

@@ -942,6 +942,7 @@ pub struct LintCommonOptions {
     // WARNING: Don't add new options to this type. Add them to `LintOptions` instead.
 }
 
+/// Options for the `flake8-annotations` plugin.
 #[cfg_attr(feature = "schemars", derive(schemars::JsonSchema))]
 #[derive(
     Clone, Debug, PartialEq, Eq, Default, OptionsMetadata, CombineOptions, Serialize, Deserialize,
@@ -1011,6 +1012,7 @@ impl Flake8AnnotationsOptions {
     }
 }
 
+/// Options for the `flake8-bandit` plugin.
 #[derive(
     Clone, Debug, PartialEq, Eq, Default, Serialize, Deserialize, OptionsMetadata, CombineOptions,
 )]
@@ -1059,6 +1061,7 @@ impl Flake8BanditOptions {
     }
 }
 
+/// Options for the `flake8-boolean-trap` plugin
 #[derive(
     Clone, Debug, PartialEq, Eq, Default, Serialize, Deserialize, OptionsMetadata, CombineOptions,
 )]
@@ -1085,6 +1088,7 @@ impl Flake8BooleanTrapOptions {
     }
 }
 
+/// Options for the `flake8-bugbear` plugin.
 #[derive(
     Clone, Debug, PartialEq, Eq, Default, Serialize, Deserialize, OptionsMetadata, CombineOptions,
 )]
@@ -1115,6 +1119,8 @@ impl Flake8BugbearOptions {
         }
     }
 }
+
+/// Options for the `flake8-builtins` plugin.
 #[derive(
     Clone, Debug, PartialEq, Eq, Default, Serialize, Deserialize, OptionsMetadata, CombineOptions,
 )]
@@ -1145,6 +1151,8 @@ impl Flake8BuiltinsOptions {
         }
     }
 }
+
+/// Options for the `flake8-comprehensions` plugin.
 #[derive(
     Clone, Debug, PartialEq, Eq, Default, Serialize, Deserialize, OptionsMetadata, CombineOptions,
 )]
@@ -1170,6 +1178,7 @@ impl Flake8ComprehensionsOptions {
     }
 }
 
+/// Options for the `flake8-copyright` plugin.
 #[derive(
     Clone, Debug, PartialEq, Eq, Default, Serialize, Deserialize, OptionsMetadata, CombineOptions,
 )]
@@ -1225,6 +1234,7 @@ impl Flake8CopyrightOptions {
     }
 }
 
+/// Options for the `flake8-errmsg` plugin.
 #[derive(
     Clone, Debug, PartialEq, Eq, Default, Serialize, Deserialize, OptionsMetadata, CombineOptions,
 )]
@@ -1244,6 +1254,7 @@ impl Flake8ErrMsgOptions {
     }
 }
 
+/// Options for the `flake8-gettext` plugin.
 #[derive(
     Clone, Debug, PartialEq, Eq, Default, Serialize, Deserialize, OptionsMetadata, CombineOptions,
 )]
@@ -1281,6 +1292,7 @@ impl Flake8GetTextOptions {
     }
 }
 
+/// Options for the `flake8-implicit-str-concat` plugin
 #[derive(
     Clone, Debug, PartialEq, Eq, Default, Serialize, Deserialize, OptionsMetadata, CombineOptions,
 )]
@@ -1315,6 +1327,7 @@ impl Flake8ImplicitStrConcatOptions {
     }
 }
 
+/// Options for the `flake8-import-conventions` plugin
 #[derive(
     Clone, Debug, PartialEq, Eq, Default, Serialize, Deserialize, OptionsMetadata, CombineOptions,
 )]
@@ -1468,6 +1481,7 @@ impl Flake8ImportConventionsOptions {
     }
 }
 
+/// Options for the `flake8-pytest-style` plugin
 #[derive(
     Clone, Debug, PartialEq, Eq, Default, Serialize, Deserialize, OptionsMetadata, CombineOptions,
 )]
@@ -1658,6 +1672,7 @@ impl Flake8PytestStyleOptions {
     }
 }
 
+/// Options for the `flake8-quotes` plugin.
 #[derive(
     Clone, Debug, PartialEq, Eq, Default, Serialize, Deserialize, OptionsMetadata, CombineOptions,
 )]
@@ -1730,6 +1745,7 @@ impl Flake8QuotesOptions {
     }
 }
 
+/// Options for the `flake8_self` plugin.
 #[derive(
     Clone, Debug, PartialEq, Eq, Default, Serialize, Deserialize, OptionsMetadata, CombineOptions,
 )]
@@ -1770,6 +1786,7 @@ impl Flake8SelfOptions {
     }
 }
 
+/// Options for the `flake8-tidy-imports` plugin
 #[derive(
     Clone, Debug, PartialEq, Eq, Default, Serialize, Deserialize, OptionsMetadata, CombineOptions,
 )]
@@ -1827,6 +1844,7 @@ impl Flake8TidyImportsOptions {
     }
 }
 
+/// Options for the `flake8-type-checking` plugin
 #[derive(
     Clone, Debug, PartialEq, Eq, Default, Serialize, Deserialize, OptionsMetadata, CombineOptions,
 )]
@@ -1971,6 +1989,7 @@ impl Flake8TypeCheckingOptions {
     }
 }
 
+/// Options for the `flake8-unused-arguments` plugin
 #[derive(
     Clone, Debug, PartialEq, Eq, Default, Serialize, Deserialize, OptionsMetadata, CombineOptions,
 )]
@@ -1994,6 +2013,7 @@ impl Flake8UnusedArgumentsOptions {
     }
 }
 
+/// Options for the `isort` plugin.
 #[derive(
     Clone, Debug, PartialEq, Eq, Default, Serialize, Deserialize, OptionsMetadata, CombineOptions,
 )]
@@ -2641,6 +2661,7 @@ impl IsortOptions {
     }
 }
 
+/// Options for the `mccabe` plugin.
 #[derive(
     Clone, Debug, PartialEq, Eq, Default, Serialize, Deserialize, OptionsMetadata, CombineOptions,
 )]
@@ -2669,6 +2690,7 @@ impl McCabeOptions {
     }
 }
 
+/// Options for the `pep8-naming` plugin.
 #[derive(
     Clone, Debug, PartialEq, Eq, Default, Serialize, Deserialize, OptionsMetadata, CombineOptions,
 )]
@@ -2761,6 +2783,7 @@ impl Pep8NamingOptions {
     }
 }
 
+/// Options for the `pycodestyle` plugin.
 #[derive(
     Clone, Debug, PartialEq, Eq, Default, Serialize, Deserialize, OptionsMetadata, CombineOptions,
 )]
@@ -2835,6 +2858,7 @@ impl PycodestyleOptions {
     }
 }
 
+/// Options for the `pydocstyle` plugin.
 #[derive(
     Clone, Debug, PartialEq, Eq, Default, Serialize, Deserialize, OptionsMetadata, CombineOptions,
 )]
@@ -2942,6 +2966,7 @@ impl PydocstyleOptions {
     }
 }
 
+/// Options for the `pydoclint` plugin.
 #[derive(
     Clone, Debug, PartialEq, Eq, Default, Serialize, Deserialize, OptionsMetadata, CombineOptions,
 )]
@@ -2971,6 +2996,7 @@ impl PydoclintOptions {
     }
 }
 
+/// Options for the `pyflakes` plugin.
 #[derive(
     Clone, Debug, PartialEq, Eq, Default, Serialize, Deserialize, OptionsMetadata, CombineOptions,
 )]
@@ -3015,6 +3041,7 @@ impl PyflakesOptions {
     }
 }
 
+/// Options for the `pylint` plugin.
 #[derive(
     Clone, Debug, PartialEq, Eq, Default, Serialize, Deserialize, OptionsMetadata, CombineOptions,
 )]
@@ -3124,6 +3151,7 @@ impl PylintOptions {
     }
 }
 
+/// Options for the `pyupgrade` plugin.
 #[derive(
     Clone, Debug, PartialEq, Eq, Default, Serialize, Deserialize, OptionsMetadata, CombineOptions,
 )]
@@ -3179,6 +3207,7 @@ impl PyUpgradeOptions {
     }
 }
 
+/// Options for the `ruff` plugin
 #[derive(
     Clone, Debug, PartialEq, Eq, Default, Serialize, Deserialize, OptionsMetadata, CombineOptions,
 )]