[docs] include tox.ini for 1.9.13 archive release

Author: cmpadden

Diff for: .github/workflows/build-docs-revamp.yml

@@ -10,6 +10,7 @@ on:
       - docs/docs-beta/**
       - examples/docs_beta_snippets/**
       - docs/sphinx/**
+      - docs/tox.ini
   pull_request:
     paths:
       - docs/docs-beta/**