docs: use JavaScript code blocks in README examples

Also register the rule in the ESLint plugin namespace.

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
report:
  - task: lint_filenames
    status: passed
  - task: lint_editorconfig
    status: passed
  - task: lint_markdown
    status: passed
  - task: lint_package_json
    status: na
  - task: lint_repl_help
    status: na
  - task: lint_javascript_src
    status: passed
  - task: lint_javascript_cli
    status: na
  - task: lint_javascript_examples
    status: na
  - task: lint_javascript_tests
    status: na
  - task: lint_javascript_benchmarks
    status: na
  - task: lint_python
    status: na
  - task: lint_r
    status: na
  - task: lint_c_src
    status: na
  - task: lint_c_examples
    status: na
  - task: lint_c_benchmarks
    status: na
  - task: lint_c_tests_fixtures
    status: na
  - task: lint_shell
    status: na
  - task: lint_typescript_declarations
    status: passed
  - task: lint_typescript_tests
    status: na
  - task: lint_license_headers
    status: passed
---

Author: Planeshifter

lib/node_modules/@stdlib/_tools/eslint/rules/doctest-annotation-spacing/README.md

@@ -45,21 +45,27 @@ var rule = require( '@stdlib/_tools/eslint/rules/doctest-annotation-spacing' );
 
 **Bad** (too many spaces after `returns`):
 
-```text
+<!-- eslint-disable stdlib/doctest-annotation-spacing -->
+
+```javascript
 var v = 3.14;
 // returns             3.14
 ```
 
 **Bad** (no space before `=>`):
 
-```text
+<!-- eslint-disable stdlib/doctest-annotation-spacing, spaced-comment -->
+
+```javascript
 console.log( 'beep' );
 //=> 'beep'
 ```
 
 **Bad** (too many spaces before `returns`):
 
-```text
+<!-- eslint-disable stdlib/doctest-annotation-spacing, spaced-comment -->
+
+```javascript
 var x = true;
 //  returns true
 ```

lib/node_modules/@stdlib/_tools/eslint/rules/lib/index.js

@@ -54,6 +54,15 @@ setReadOnly( rules, 'capitalized-comments', require( '@stdlib/_tools/eslint/rule
 */
 setReadOnly( rules, 'doctest', require( '@stdlib/_tools/eslint/rules/doctest' ) );
 
+/**
+* @name doctest-annotation-spacing
+* @memberof rules
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/_tools/eslint/rules/doctest-annotation-spacing}
+*/
+setReadOnly( rules, 'doctest-annotation-spacing', require( '@stdlib/_tools/eslint/rules/doctest-annotation-spacing' ) );
+
 /**
 * @name doctest-marker
 * @memberof rules