fix typo and reformulate small part

git-examples.md

@@ -70,7 +70,7 @@ There you should see the message that a new branch has been pushed to your forke
 ## Common pitfalls
 
 ### Force push to forked repository
-After having done the first PR, people from the PX4 community will review your changes. In most cases this means that you have to fix your local branch according to the review. Afther the changes have been done locally, the feature branch needs to be rebased again with the most recent upstream/master. However, after the rebase, it is no longer possible to push the feature branch to your local forked repository directly, but instead you need to use a force push:
+After having done the first PR, people from the PX4 community will review your changes. In most cases this means that you have to fix your local branch according to the review. After changing the files locally, the feature branch needs to be rebased again with the most recent upstream/master. However, after the rebase, it is no longer possible to push the feature branch to your forked repository directly, but instead you need to use a force push:
 ```sh
 git push --force-with-lease origin <your feature branch name>
 ```