added link to advanced indexing guide in .loc docstring
closes #46620
Not sure if the online documentation also needs to change with this docstring.
if it does, how can I change that?
Hello @INDIG0N! Thanks for updating this PR. We checked the lines you've touched for [PEP 8](https://www.python.org/dev/peps/pep-0008) issues, and found:



There are currently no PEP 8 issues detected in this Pull Request. Cheers! :beers: 

##### Comment last updated at 2022-06-27 22:50:54 UTC Thanks @INDIG0N 