[API Reference docs] Remove git references from GitHub Action templates (#813)

* Update reference

* Remove rogue git references

* Specify `main` as a reference

Author: LysandreJik

.github/workflows/build_documentation.yaml

@@ -9,7 +9,7 @@ on:
 
 jobs:
    build:
-    uses: huggingface/doc-builder/.github/workflows/build_main_documentation.yml@workflow_templates
+    uses: huggingface/doc-builder/.github/workflows/build_main_documentation.yml@main
     with:
       commit_sha: ${{ github.sha }}
       package: huggingface_hub

.github/workflows/delete_doc_comment.yaml

@@ -7,7 +7,7 @@ on:
 
 jobs:
   delete:
-    uses: huggingface/doc-builder/.github/workflows/delete_doc_comment.yml@workflow_templates
+    uses: huggingface/doc-builder/.github/workflows/delete_doc_comment.yml@main
     with:
       pr_number: ${{ github.event.number }}
       package: huggingface_hub