chore: Fix grammatical errors

Author: raklaptudirm

CONTRIBUTING.md

@@ -76,7 +76,7 @@ To maximize the readability and correctness of our code, we require that new sub
     $ standard MyFile.js  // if that fails, try: npx standard MyFile.js
     ```
 
-- Use camelCase with leading character lowercase for identifier names (variables and functions)
+- Use camelCase with the leading character as lowercase for identifier names (variables and functions)
 - Names start with a letter
 - follow code indentation
   - Always use 2 spaces for indentation of code blocks