docs: update title and code highlighting for github_repository_ruleset (#2285)

Co-authored-by: Nick Floyd <[email protected]>

Author: stefanfreitag

website/docs/r/repository_ruleset.html.markdown

@@ -5,15 +5,15 @@ description: |-
   Creates a GitHub repository ruleset.
 ---
 
-# github_repository_ruleset (Resource)
+# github_repository_ruleset
 
 Creates a GitHub repository ruleset.
 
 This resource allows you to create and manage rulesets on the repository level. When applied, a new ruleset will be created. When destroyed, that ruleset will be removed.
 
 ## Example Usage
 
-```
+```hcl
 resource "github_repository" "example" {
   name        = "example"
   description = "Example repository"