Improving documentation of models.encodings.entangling_layer

[renatomello]

Checklist:

• Reviewers confirm new code works as expected.
• Tests are passing.
• Coverage does not decrease.
• Documentation is updated.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.85%. Comparing base (d1eecbb) to head (65aee42).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1273   +/-   ##
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  Coverage   99.85%   99.85%           
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  Files          73       73           
  Lines       10690    10690           
=======================================
  Hits        10674    10674           
  Misses         16       16           

Flag	Coverage Δ
unittests	99.85% <ø> (ø)

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[MatteoRobbiati]

Thanks @renatomello!

I think it would be better to standardize a bit more the images in the section. To do this, we should keep the width in the usual range of 400px-800px, and regulate the height. For helping in this, I opened #1278, where the scale tag is removed and the images widths and heights are rescaled to fit the aforementioned range.

The #1278 is pointing here, thus I would suggest to check that one and then proceed with this PR.

A couple of suggestions follow.

[MatteoRobbiati]

Thanks.