[DOC] Fix position of plots in relation to code blocks

[ymzayek]

Part of #3728.

Fix stuff like this:

To become this:

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[codecov]

Codecov Report

Merging #3788 (a3f4239) into main (7d91e88) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #3788   +/-   ##
=======================================
  Coverage   91.52%   91.52%           
=======================================
  Files         133      133           
  Lines       15557    15557           
  Branches     3229     3229           
=======================================
  Hits        14238    14238           
  Misses        772      772           
  Partials      547      547           

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macos-latest_3.10	91.44% <ø> (?)
macos-latest_3.11	91.44% <ø> (ø)
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macos-latest_3.9	91.40% <ø> (?)
ubuntu-latest_3.10	91.44% <ø> (?)
ubuntu-latest_3.9	?
windows-latest_3.10	?

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[ymzayek]

All the changed examples are the ones with the rendered thumbnails found here: https://output.circle-artifacts.com/output/job/d0c106ac-119e-4f16-b188-2a70c295791d/artifacts/0/dev/auto_examples/index.html

[bthirion]

LGTM so far.

[ymzayek]

This one's ready. The failures are being dealt with in another PR

[bthirion]

LGTM, thx !

[Remi-Gau]

Thanks @ymzayek