Remove transitions from docs to comply with warnings from sphinx-check

[akihironitta]

What does this PR do?

Fixes #490.

This PR removes transitions in the docs to resolve warnings:

Document or section may not begin with a transition.

from CI sphinx-check.

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Below is the example of the changes in the docs. https://pytorch-lightning-bolts.readthedocs.io/en/latest/self_supervised_models.html#byol

Before the change

After the change

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[codecov]

Codecov Report

Merging #491 (cf95a86) into master (edc6553) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #491   +/-   ##
=======================================
  Coverage   79.10%   79.10%           
=======================================
  Files         102      102           
  Lines        5892     5892           
=======================================
  Hits         4661     4661           
  Misses       1231     1231           

Flag	Coverage Δ
cpu	25.19% <ø> (ø)
pytest	25.19% <ø> (ø)
unittests	78.54% <ø> (ø)

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[akihironitta]

@Borda It seems there is no way to disable Unchanged files with check annotations (Beta) as the issue actions/toolkit#457 is still open, so I'll try to resolve those warnings from sphinx-check in this PR instead of turning off the feature Unchanged files with check annotations (Beta).

[Borda]

yeah, I was thinking rather fix the warnings then suppress them from PRs :]

[Borda]

I think that @williamFalcon made it on purpose, so is there another way how to have a horizontal line?

[akihironitta]

I looked through the docs, but I'm still not sure if there's another way to draw a horizontal line...

• reStructuredText Markup Specification
• Sphinx documentation contents

[Borda]

could it be this one? https://docutils.sourceforge.io/docs/ref/doctree.html#transition
so let's just remove it at this moment :]

[Borda]

mind check the two failing test for make and test docs seem like we need to mock the packages...

[akihironitta]

@Borda Would you mind checking the changes again?