changes documented post successful local tests have run.

Author: shresth-keshari

doc/changes/devel/13165.bugfix.rst

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+Fixes behavior of stc.save() as mentioned in issue #13158 :meth:`stc.save` and in `test_source_estimate.py` by `Shresth Keshari`.
+- Changed filetype to "auto"
+- saving a `.stc` file automatically saves two files with suffix `-lh.stc` and `-rh.stc`, which is intuitive and removes any confusion.
+- there were problems with pytest later on, which were tackled by minor tweaks.