Fix typos

Author: Jeshurun Hembd

Documentation/Contributors/ReleaseGuide/PatchReleases/README.md

@@ -61,7 +61,7 @@ npm version patch --no-git-tag-version
 - Move any relevant items in the list to the new header in `CHANGES.md`.
 - Delete any empty headers.
 - Ensure each change is nested in the section for the relevant workspace.
-- Commit any staged changed and push to your branch.
+- Commit any staged changes and push to your branch.
 
 ### 5. Release build and sanity test
 

Documentation/Contributors/ReleaseGuide/Prereleases/README.md

@@ -79,7 +79,7 @@ npm version prerelease --preid <tag> --no-git-tag-version
 - Move any relevant items in the list to the new header in `CHANGES.md`.
 - Delete any empty headers.
 - Ensure each change is nested in the section for the relevant workspace.
-- Commit any staged changed and push to your branch.
+- Commit any staged changes and push to your branch.
 
 ### 5. Release build and sanity test
 

Documentation/Contributors/ReleaseGuide/README.md

@@ -4,7 +4,7 @@ We release CesiumJS on the first work day of every month.
 
 - [**Release Schedule**](./ReleaseSchedule.md): The upcoming monthly release schedule and the developer responsible for managing each release
 - [**Patch Release Guide**](./PatchReleases/README.md): If and how to publish a patch release[^1] ahead of the regular monthly release, typically used in the case of a significant regression or an issue with published dependency versions.
-- [**Perelease Guide**](./Prereleases/README.md): If and how to publish a tagged prerelease[^2] ahead of the regular monthly release, typically used for internal testing.
+- [**Prerelease Guide**](./Prereleases/README.md): If and how to publish a tagged prerelease[^2] ahead of the regular monthly release, typically used for internal testing.
 
 [^1]: See ["About semantic versioning" on docs.npmjs.com](https://docs.npmjs.com/about-semantic-versioning)