docs: extended contribution guidelines

Signed-off-by: Jan Kowalleck <[email protected]>

Author: jkowalleck

CONTRIBUTING.md

@@ -4,7 +4,7 @@ Any contribution is welcome.
 Please read the [CycloneDX contributing guidelines](https://github.com/CycloneDX/.github/blob/master/CONTRIBUTING.md) first.
 
 Pull-requests from forks are welcome.  
-We love to see your purposed changes, but we also like to discuss things first. Please open a ticket and explain your intended changes to the community. And don't forget to mention that discussion in your pullrequest later. 
+We love to see your purposed changes, but we also like to discuss things first. Please open a ticket and explain your intended changes to the community. And don't forget to mention that discussion in your pull-request later. 
 Find the needed basics here:
 * [how to fork a repository](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/working-with-forks/fork-a-repo)
 * [how create a pull request from a fork](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/creating-a-pull-request-from-a-fork)