Typo Update release-guide.md

The word relase is incorrect; the correct spelling is release.

docs/maintainers/release-guide.md

@@ -15,7 +15,7 @@ The target audience for this guide is maintainers of this repo. In general, the
 1. Choose a version tag based on [Semantic Versioning](https://semver.org/). Include the `-rc` suffix followed by the next integer. RCs start at 0.
 1. Change the target branch to `v1.x` or `v2.x` based on the version you're releasing.
 1. Click **Generate release notes**.
-1. Toggle on the **Set as a pre-relase** checkbox.
+1. Toggle on the **Set as a pre-release** checkbox.
 1. **Publish release**.
 
 ### After creating the release candidate