Add improved docs

Author: wooorm

readme.md

@@ -17,7 +17,7 @@
 *   [Install](#install)
 *   [Use](#use)
 *   [API](#api)
-    *   [`findAllAfter(parent, node|index[, test])`](#findallafterparent-nodeindex-test)
+    *   [`findAllAfter(parent, child|index[, test])`](#findallafterparent-childindex-test)
 *   [Types](#types)
 *   [Compatibility](#compatibility)
 *   [Related](#related)
@@ -38,7 +38,7 @@ But this helps when integrating with the rest of unified and unist.
 ## Install
 
 This package is [ESM only][esm].
-In Node.js (version 12.20+, 14.14+, 16.0+, 18.0+), install with [npm][]:
+In Node.js (version 14.14+ and 16.0+), install with [npm][]:
 
 ```sh
 npm install unist-util-find-all-after
@@ -47,14 +47,14 @@ npm install unist-util-find-all-after
 In Deno with [`esm.sh`][esmsh]:
 
 ```js
-import {findAllAfter} from "https://esm.sh/unist-util-find-all-after@4"
+import {findAllAfter} from 'https://esm.sh/unist-util-find-all-after@4'
 ```
 
 In browsers with [`esm.sh`][esmsh]:
 
 ```html
 <script type="module">
-  import {findAllAfter} from "https://esm.sh/unist-util-find-all-after@4?bundle"
+  import {findAllAfter} from 'https://esm.sh/unist-util-find-all-after@4?bundle'
 </script>
 ```
 
@@ -89,18 +89,28 @@ Yields:
 
 ## API
 
-This package exports the identifier `findAllAfter`.
+This package exports the identifier [`findAllAfter`][api-findallafter].
 There is no default export.
 
-### `findAllAfter(parent, node|index[, test])`
+### `findAllAfter(parent, child|index[, test])`
 
-Find the nodes in `parent` ([`Parent`][parent]) after another `node`
-([`Node`][node]) or after an index, that pass `test` (`Test` from
-[`unist-util-is`][test]).
+Find the nodes in `parent` before a `child` or before an index, that pass
+`test`.
+
+###### Parameters
+
+*   `parent` ([`Node`][node])
+    — parent node
+*   `index` (`number`)
+    — index of child in `parent`
+*   `child` ([`Node`][node])
+    — child in `parent`
+*   `test` ([`Test`][test])
+    — `unist-util-is`-compatible test
 
 ###### Returns
 
-Children of `parent` that pass `test` ([`Array<Node>`][node]).
+Children of `parent` ([`Array<Node>`][node]).
 
 ## Types
 
@@ -111,7 +121,7 @@ It exports no additional types (types for the test are in `unist-util-is`).
 
 Projects maintained by the unified collective are compatible with all maintained
 versions of Node.js.
-As of now, that is Node.js 12.20+, 14.14+, 16.0+, and 18.0+.
+As of now, that is Node.js 14.14+ and 16.0+.
 Our projects sometimes work with older versions, but this is not guaranteed.
 
 ## Related
@@ -207,6 +217,6 @@ abide by its terms.
 
 [node]: https://github.com/syntax-tree/unist#node
 
-[parent]: https://github.com/syntax-tree/unist#parent-1
-
 [test]: https://github.com/syntax-tree/unist-util-is#test
+
+[api-findallafter]: #findallafterparent-childindex-test