Update release modification guidelines in documentation

Removed extra "to", and updated the list of unchangeable elements on a release.

Author: MissedTheMark

src/pages/docs/best-practices/deployments/releases-and-deployments.md

@@ -48,13 +48,13 @@ You can update the following in a release:
 - Package version
 - Release notes
 - Variables
+- Channel
 
 However, you cannot change the following in the release snapshot:
 
-- Channel
 - Deployment Process
 
-Never to modify a release unless it is absolutely necessary. A release represents a snapshot in time, and it should be the same when deploying to the different stages or environments in your pipeline. Changing it after the fact can lead to unpredictable results.
+Never modify a release unless it is absolutely necessary. A release represents a snapshot in time, and it should be the same when deploying to the different stages or environments in your pipeline. Changing it after the fact can lead to unpredictable results.
 
 ## Deploying a release