docs: Fix typos in CONTRIBUTING guide (parse-community#8629)

Author: mtrezza

CONTRIBUTING.md

@@ -159,7 +159,7 @@ If your pull request contains work from someone else then you are required to ge
 
 > *Can I get write access to the repository to make changes faster?*
 
-Keeping our products safe and secure is one of your top priorities. Our security policy mandates that write access to repositories is only provided to as few people as necessary. All usual contributions can be made via public pull requests. If you think you need write access, contact the repository team and explain in detail what the containt is that you are trying to overcome. We want to make contributing for you as easy as possible. If there are any bottlenecks that are slowing you down we will be happy to look into it to improve your contribution experience.
+Keeping our products safe and secure is one of your top priorities. Our security policy mandates that write access to repositories is only provided to as few people as necessary. All usual contributions can be made via public pull requests. If you think you need write access, contact the repository team and explain in detail what the constraint is that you are trying to overcome. We want to make contributing for you as easy as possible. If there are any bottlenecks that are slowing you down we are happy to receive your feedback to see where we can improve.
 
 ### New Private Repository