Go to the Wikipedia page in question,in your case the AD Mobile Weapons list article.
Clck on the history tab on top of the page.This should be it.
You get to compare differences between pages
[What has changed].The site keeps a log on all versions,so if someone keeps putting useless stuff there,just try reverting it to the last version that does not have it.
I've done the checking in your case,its some guy named "Maverick281182".
And he is quick,one of his edits was one minutes after yours,I can tell from the log.
Or for simplicity's sake,you can follow this link directly:
http://en.wikipedia.org/w/index.php?...action=history
Wikipedia is a pain to manage,at least I'm respected a bit and listened to in Gundam Wikia,or at least one powerful editor takes what I say for credibility,since I love citing sources.But either way,these things can make you age faster.