chore(docs): Made conventional-commits syntax optional for PR contributions

When a PR is merged, the commit messages made to the fork are not the ones that go into the main repository's git history, but rather the commit message of the commit that merges that PR into the repository. Hence, it's up to the maintainer of the main repository to maintain the conventional-commits syntax

Author: ItsIgnacioPortal

CONTRIBUTING.md

@@ -14,7 +14,7 @@ Significant effort SHOULD be made to give attribution for these lists whenever p
 
 Folders should be named with the train case scheme, for example `File-System`.
 
-## Conventional Commits
+## Conventional Commits (optional for contributions made through Pull Requests)
 
 All commits related to contributions to seclists are encouraged to use the [Conventional-Commits v1.0.0](https://www.conventionalcommits.org/en/v1.0.0/) syntax