Doc: make more comprehensive "see also" sections in filters + fix

[sciunto]

Description

Checklist

• Docstrings for all functions
• Gallery example in ./doc/examples (new features only)
• Benchmark in ./benchmarks, if your changes aren't covered by an
  existing benchmark
• Unit tests
• Clean style in the spirit of PEP8

For reviewers

• Check that the PR title is short, concise, and will make sense 1 year
  later.
• Check that new functions are imported in corresponding __init__.py.
• Check that new features, API changes, and deprecations are mentioned in
  doc/release/release_dev.rst.

[rfezzani]

Thank you @sciunto, I'll wait for CI artifact to see if everything is fine, then merge 😉.

[rfezzani]

Unfortunately feature.canny is not correctly linked 🙁

[sciunto]

Unfortunately feature.canny is not correctly linked slightly_frowning_face

I was convinced that was, but obviously, there is not reason. I wrote the full path and it must work like this.

[sciunto]

Fixed

[rfezzani]

Thank you @sciunto 😉