Docs: Improve README headers (#208)

Author: bmish

README.md

@@ -5,8 +5,10 @@ An ESLint plugin for linting ESLint plugins. Rules written in CJS, ESM, and Type
 <!-- vscode-markdown-toc -->
 * [Installation](#Installation)
 * [Usage](#Usage)
-* [Supported Rules](#SupportedRules)
-* [Supported Presets](#SupportedPresets)
+* [Rules](#Rules)
+* [Presets](#Presets)
+  * [Semantic versioning policy](#Semanticversioningpolicy)
+  * [Preset usage](#Presetusage)
 
 <!-- vscode-markdown-toc-config
 	numbering=false
@@ -50,7 +52,7 @@ Then configure the rules you want to use under the rules section.
 }
 ```
 
-## <a name='SupportedRules'></a>Supported Rules
+## <a name='Rules'></a>Rules
 
 * ✔️ if the rule belongs to the `recommended` configuration
 * 🛠 if some problems reported by the rule are automatically fixable by the `--fix` [command line](https://eslint.org/docs/user-guide/command-line-interface#fixing-problems) option
@@ -85,7 +87,7 @@ Name | ✔️ | 🛠 | 💡 | Description
 [test-case-shorthand-strings](https://github.com/not-an-aardvark/eslint-plugin-eslint-plugin/blob/master/docs/rules/test-case-shorthand-strings.md) |  | 🛠 |  | enforce consistent usage of shorthand strings for test cases with no options
 <!-- __END AUTOGENERATED TABLE__ -->
 
-## <a name='SupportedPresets'></a>Supported Presets
+## <a name='Presets'></a>Presets
 
 |   | Name | Description |
 |:--|:-----|:------------|
@@ -96,8 +98,12 @@ Name | ✔️ | 🛠 | 💡 | Description
 |   | `rules` | enables all rules that are aimed at linting ESLint rule files |
 |   | `tests` | enables all rules that are aimed at linting ESLint test files |
 
+### <a name='Semanticversioningpolicy'></a>Semantic versioning policy
+
 The list of recommended rules will only change in a major release of this plugin. However, new non-recommended rules might be added in a minor release of this plugin. Therefore, the using the `all`, `rules`, and `tests` presets is **not recommended for production use**, because the addition of new rules in a minor release could break your build.
 
+### <a name='Presetusage'></a>Preset usage
+
 Presets are enabled by adding a line to the `extends` list in your config file. For example, to enable the `recommended` preset, use:
 
 ```json