My question has been edited to put some terms in grey highlighting and I don't understand why.
what does the grey highlighting mean?
There are so many reason for editing a post. But if i consider your post then you have used a term ootb which is not a original word, its an abbreviation of Out of The Box. As we all are aware that abbreviations are always written in capital letters.
Also if you use some of the word that describe some product feature like you used "site collection Recycle Bin" while we all know that this term is written in SharePoint site as "Site Collection Recycle Bin".
Make one thing sure that if your post has been edited it doesn't mean that someone is trying to make you feel that you have done mistake in post, its just they want to maintain the decorum of the SE so that we can have the best quality of posts.
Primary reason for editing questions is applying proper formatting to question. So it becomes more readable. It gives proper understanding what is question about and what are important things to look after.
Grey Highlighted means its a code block with preformatting applied. If you post some piece of code it will loose all indents, spacing, formatting. But if you apply it the
Grey Highlighted formatting it will look pretty like the code in visual studio/ or some editor (but not in readonly mode).