You need a minimum of 1 reputation to suggest an edit. When an edit is suggested, what happens is this:
- it goes into a review queue where it takes 2 trusted community members to agree that it is a good edit. A trusted community member is someone who has managed to earn more than 2,000 reputation (this is not to be confused with the "trusted user" status you can earn at 20,000).
Also, your content here is under a Creative Commons license, so you don't really have a choice. Everyone needs to be able to edit your questions and answers to fulfill the letter of the license. For more information, take a look at the FAQ.
http://askubuntu.com/faq#editinghttps://askubuntu.com/faq#editing
Lastly, edits are designed to be used for the purposes of updating, fixing invalid information, improving formatting for readability - and that is what it is used for.