docs: update commit_message arg desc for repository_file resource (#2125

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Co-authored-by: Keegan Campbell <[email protected]>

website/docs/r/repository_file.html.markdown

@@ -51,7 +51,7 @@ The following arguments are supported:
 
 * `commit_email` - (Optional) Committer email address to use. **NOTE:** GitHub app users may omit author and email information so GitHub can verify commits as the GitHub App. This may be useful when a branch protection rule requires signed commits.
 
-* `commit_message` - (Optional) Commit message when adding or updating the managed file.
+* `commit_message` - (Optional) The commit message when creating, updating or deleting the managed file.
 
 * `overwrite_on_create` - (Optional) Enable overwriting existing files. If set to `true` it will overwrite an existing file with the same name. If set to `false` it will fail if there is an existing file with the same name.