Once you have been bestowed with the coveted "Editing privilege", the community has said to you -
Go for it! You seem to know what you're doing... Edit away!
Before you have that privilege however, your edits will need to be peer reviewed. Don't hesitate to make edits that you feel will be improving the post. Even if you make a "bad" call be sure that some one else will come and correct it.
To quote the Edit privilege page - http://meta.stackoverflow.com/privileges/edit
Any time you feel you can make the post better, and are inclined to do
so. Editing is encouraged!
Some common reasons to edit are:
- to fix grammatical or spelling mistakes
- to clarify the meaning of a post without changing it
- to correct minor mistakes or add addendums / updates as the post ages
- to add related resources or hyperlinks
IMO one could see slang/abbreviations/lolspeech/leetspeak as an intentional grammatical and/or spelling "mistake".
In the case of "l33t spk" - its a no-brainer. Edit it out and possibly leave a comment to the OP mentioning the "professional" nature of the site and how such language is inappropriate. Just be polite as the OP possibly was just trying to
Speak to them in their own language (those nerds ;).