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Address some sphinx warnings

We've developed a number of warnings in our docs build again. This
commit does a bit of cleaning up to remove most of these. The remaining
warnings are old pages (like faq.rst) not being in any toctrees, and
issues in docstrings of the generated protobuf stubs, which we don't
really need to worry about fixing.
6 jobs for sotk/documentation/cleanups in 13 minutes and 20 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #515750855
documentation

00:02:14

passed #515750853
dummy-tests

00:01:51

passed #515750854
e2e-tests

00:05:51

passed #515750852
type-check

00:08:23

passed #515750851
unit-tests

00:11:54

 
  Post
passed #515750856
coverage

00:01:25

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