Updated How to merge a PR (markdown)

How-to-merge-a-PR.md

@@ -1,13 +1,13 @@
 1. Create you PR (ideally ask in an issue if that is a good idea what you want to do)
-2. Wait for a Maintainer review
+2. Wait for a maintainer review
 3. Do the requested changes
-4. Rebase with `dev` if its necessary:
+4. Rebase with `dev` if it is necessary:
 ```bash
 git checkout dev
 git pull
 git checkout <the_branch_im_working_in>
 git rebase dev
-## The rebase might consist of several commits so you might have to do this several times after resolving a collision:
+## The rebase might consist of several commits, so you might have to do this several times after resolving a collision:
 git rebase --continue
 ### Check if everything works, and no tests fail.
 ```