Update source/user_guide/creating.rst
Add a line mentioning the regex ^(?:[a-z][a-z0-9_]+/)*[a-z][a-z0-9_]+/?$ to the getting started documentation
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Add a line mentioning the regex ^(?:[a-z][a-z0-9_]+/)*[a-z][a-z0-9_]+/?$ to the getting started documentation