docs: fix a typo in CONTRIBUTING.md (#130)

Author: alexandear

Diff for: CONTRIBUTING.md

@@ -11,7 +11,7 @@ please explain why in the pull request description.
 
 ### Releasing
 
-Commits that would precipitate a SemVer change, as desrcibed in the Conventional
+Commits that would precipitate a SemVer change, as described in the Conventional
 Commits Specification, will trigger [`release-please`](https://github.com/google-github-actions/release-please-action)
 to create a release candidate pull request. Once submitted, `release-please`
 will create a release.