docs: refine API docs for files in Editor dir

[devvaannsh]

The following changes are made :

Removed CommandHandler.md from the API docs – This file is removed from API docs, as this in an internal module.

Marked deprecated methods as @private in EditorManager.js – The deprecated methods are now marked as @private to remove them from API docs,

Tweaked jsdoc style comments in Editor.js where required – Changed /** ... */ to /* ... */ so they don’t show up in the API docs. Now, the comments stay in the code without cluttering the docs.