Fix doc of data source github_repository_file (#1161)

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

Author: bpaquet

website/docs/d/repository_file.html.markdown

@@ -29,7 +29,7 @@ The following arguments are supported:
 
 * `repository` - (Required) The repository to read the file from. If an unqualified repo name (without an owner) is passed, the owner will be inferred from the owner of the token used to execute the plan. If a name of the type "owner/repo" (with a slash in the middle) is passed, the owner will be as specified and not the owner of the token.
 
-* `file` - (Required) The path of the file to manage.
+* `file` - (Required) The path of the file to read.
 
 * `branch` - (Optional) Git branch. Defaults to the repository's default branch.