chore: fix markdown linter errors in branch_protection.md (#656)

Author: mattkasa

docs/resources/branch_protection.md

@@ -40,7 +40,7 @@ The following arguments are supported:
 
 * `merge_access_level` - (Optional) One of five levels of access to the project. Valid values are: `no one`, `developer`, `maintainer`, `admin`.
 
-* `allowed_to_push`, `allowed_to_merge` - (Optional) One or more `allowed_to_push`, `allowed_to_merge` blocks as defined below. 
+* `allowed_to_push`, `allowed_to_merge` - (Optional) One or more `allowed_to_push`, `allowed_to_merge` blocks as defined below.
 
 * `code_owner_approval_required` (Optional) Bool, defaults to false. Can be set to true to require code owner approval before merging.
 
@@ -52,7 +52,6 @@ An `allowed_to_push` or `allowed_to_merge` block supports the following argument
 
 * `group_id` - (Required) The ID of a GitLab group allowed to perform the relevant action. Mutually exclusive with `user_id`.
 
-
 ## Attributes Reference
 
 The following attributes are exported:
@@ -63,7 +62,6 @@ The following attributes are exported:
 
 GitLab project freeze periods can be imported using an id made up of `project_id:branch`, e.g.
 
-
 ```
 $ terraform import gitlab_branch_protection.BranchProtect "12345:main"
 ```