docs: fixing rules.md (#4098)

* docs: fixing rules.md

* fixing typo of example from subject-case rule

* style: prettier

---------

Co-authored-by: escapedcat <github@htmlcss.de>

Author: Naedri

docs/reference/rules.md

@@ -260,15 +260,15 @@ Infinity
 
 ```js
 [
-  'lower-case',    // lower case
-  'upper-case',    // UPPERCASE
-  'camel-case',    // camelCase
-  'kebab-case',    // kebab-case
-  'pascal-case',   // PascalCase
+  'lower-case', // lower case
+  'upper-case', // UPPERCASE
+  'camel-case', // camelCase
+  'kebab-case', // kebab-case
+  'pascal-case', // PascalCase
   'sentence-case', // Sentence case
-  'snake-case',    // snake_case
-  'start-case'.    // Start Case
-]
+  'snake-case', // snake_case
+  'start-case', // Start Case
+];
 ```
 
 ## subject-empty