Merge "docs: add warning to redirects file" into klp-modular-docs

# WARNING: THIS FILE IS NOT USED IN PRODUCTION

# CHANGES MADE HERE **DO NOT EFFECT** developer.android.com

# Instead, update the following file in the current docs release branch:

# <docs-release-branch>/vendor/google/docs/app-engine-server/v3/redirects.yaml

#=============================================================================

# Redirects file.

# This file contains the list of rewrite rules that are applied when serving

# pages. Add "pattern: True" to use python regex in to or from.