doc: edit import.meta.resolve documentation

PR-URL: nodejs#49247
Refs: nodejs#49028
Reviewed-By: Geoffrey Booth <webadmin@geoffreybooth.com>
Reviewed-By: Guy Bedford <guybedford@gmail.com>

doc/api/esm.md

@@ -329,6 +329,9 @@ added:
   - v13.9.0
   - v12.16.2
 changes:
+  - version: 20.6.0
+    pr-url: https://github.com/nodejs/node/pull/49028
+    description: No longer behind the `--experimental-import-meta-resolve` flag.
   - version: v20.0.0
     pr-url: https://github.com/nodejs/node/pull/44710
     description: This API now returns a string synchronously instead of a Promise.
@@ -348,36 +351,35 @@ changes:
 
 * `specifier` {string} The module specifier to resolve relative to the
   current module.
-* Returns: {string} The absolute (`file:`) URL string for the resolved module.
+* Returns: {string} The absolute URL string that the specifier would resolve to.
 
 [`import.meta.resolve`][] is a module-relative resolution function scoped to
 each module, returning the URL string.
 
 ```js
 const dependencyAsset = import.meta.resolve('component-lib/asset.css');
 // file:///app/node_modules/component-lib/asset.css
+import.meta.resolve('./dep.js');
+// file:///app/dep.js
 ```
 
 All features of the Node.js module resolution are supported. Dependency
 resolutions are subject to the permitted exports resolutions within the package.
 
-```js
-import.meta.resolve('./dep', import.meta.url);
-// file:///app/dep
-```
+**Caveats**:
 
-> **Caveat** This can result in synchronous file-system operations, which
-> can impact performance similarly to `require.resolve`.
+* This can result in synchronous file-system operations, which
+  can impact performance similarly to `require.resolve`.
+* This feature is not available within custom loaders (it would
+  create a deadlock).
 
-Previously, Node.js implemented an asynchronous resolver which also permitted
-a second contextual argument. The implementation has since been updated to be
-synchronous, with the second contextual `parent` argument still accessible
-behind the `--experimental-import-meta-resolve` flag:
+**Non-standard API**:
 
-* `parent` {string|URL} An optional absolute parent module URL to resolve from.
+When using the `--experimental-import-meta-resolve` flag, that function accepts
+a second argument:
 
-> **Caveat** This feature is not available within module customization hooks (it
-> would create a deadlock).
+* `parent` {string|URL} An optional absolute parent module URL to resolve from.
+  **Default:** `import.meta.url`
 
 ## Interoperability with CommonJS