Docs: add .md to link(for github users) (#9529)

docs/rules/strict.md

@@ -42,7 +42,7 @@ In **ECMAScript** modules, which always have strict mode semantics, the directiv
 
 This rule requires or disallows strict mode directives.
 
-This rule disallows strict mode directives, no matter which option is specified, if ESLint configuration specifies either of the following as [parser options](../user-guide/configuring#specifying-parser-options):
+This rule disallows strict mode directives, no matter which option is specified, if ESLint configuration specifies either of the following as [parser options](/docs/user-guide/configuring.md#specifying-parser-options):
 
 * `"sourceType": "module"` that is, files are **ECMAScript** modules
 * `"impliedStrict": true` property in the `ecmaFeatures` object
@@ -66,8 +66,8 @@ This rule has a string option:
 
 The `"safe"` option corresponds to the `"global"` option if ESLint considers a file to be a **Node.js** or **CommonJS** module because the configuration specifies either of the following:
 
-* `node` or `commonjs` [environments](../user-guide/configuring#specifying-environments)
-* `"globalReturn": true` property in the `ecmaFeatures` object of [parser options](../user-guide/configuring#specifying-parser-options)
+* `node` or `commonjs` [environments](/docs/user-guide/configuring.md#specifying-environments)
+* `"globalReturn": true` property in the `ecmaFeatures` object of [parser options](/docs/user-guide/configuring.md#specifying-parser-options)
 
 Otherwise the `"safe"` option corresponds to the `"function"` option. Note that if `"globalReturn": false` is explicitly specified in the configuration, the `"safe"` option will correspond to the `"function"` option regardless of the specified environment.