Rewrite confusing wildcard docs
What does this MR do and why?
Describe in detail what your merge request does and why.
This reverts the documentation change on pages_external_url
made by @vshushlin (intended as clarification, for me: causing confusion) and tries to rewrite/copy the clarfication gist without breaking the widely referred and documented example.io
domain as basis for the Gitlab Pages deployment.
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