Okay, I'm going to explain the issue from my perspective since I was involved with rejecting some of the tags you edited.
First, keep in mind that this is a new resource. Most of us who have decent reputation here did not have enough reputation on another StackExchange site and we're still trying to figure out how things work as we're gaining reputation.
Okay, so I rejected some of the edits (like this one) because they have some formatting issues. In the example I linked, there's absolutely no reason for the word "Slingshot" to be bold. I would also put the words "called Pantheon" in parenthesis and remove the italic from the word "Pantheon". And, to quote:
.Also Slingshot, the default elementary OS application menu in Freya.
Here, there's an space character before the dot and no space character after it. The sentence after it really does not make any sense. Something like this would be better:
Pantheon comes with its own set of applications: Slingshot (application launcher), Music, Videos, Midori (web browser), Geary (email management software), Pantheon Terminal (terminal emulator) and Pantheon Files (file browser).
Unfortunately, with my current reputation, I can only select one of the stated reasons for rejecting the edit. I can't add my own custom explanation of my decision.
As for the other edits, the issue I was having with them is that they are not specifically written with elementary OS in mind. Here's an example. In this edit, you explained what LibreOffice is, but from a general perspective, not from a perspective of elementary OS. So, instead of:
LibreOffice Portable is a full-featured office suite -- including a word processor, spreadsheet, presentation tool, drawing package and database
It should be something like:
LibreOffice is a third-party office suite that can be installed from the Software Center. It comes with its own word processor (Writer), spreadsheet tool (Calc), presentation tool (Impress), drawing package (Draw) and database manager (Base).
Notice that the LibreOffice version available in the Software Center is not the portable version. Also, notice how I explained that LibreOffice does not come preinstalled with elementary OS and that it was not developed by the elementary team.
That "portable" word made me think that you have just copied the description from somewhere else and that's why I rejected it.
So, try to think from the elementary's perspective. If it's a third-party app, state that in the excerpt. Also, make sure your submission does not have any grammatical issues (place a space after the dot etc.) and I will accept it.