feat(docs): add JavaScript language documentation

Fix some grammatical errors

Author: m2y11138

docs/docs/languages/javascript.mdx

@@ -49,7 +49,7 @@ If you use JavaScript syntax extensions like JSX or JavaScript libraries/framewo
 
 ### Aliases
 
-`js`,`node`,`ecmascript`
+`js`, `node`, `ecmascript`
 
 ### Extensions