Update documentation for draw control wires change

[albi3ro]

In #2668 , the draw transform changed to use ● and ○ to denote control wires. This PR updates all the documentation to be compatible with this change.

[github-actions]

Hello. You may have forgotten to update the changelog!
Please edit doc/releases/changelog-dev.md with:

• A one-to-two sentence description of the change. You may include a small working example for new features.
• A link back to this PR.
• Your name (or GitHub username) in the contributors section.

[codecov]

Codecov Report

Merging #2682 (f2bed3b) into master (d1a607c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2682   +/-   ##
=======================================
  Coverage   99.59%   99.59%           
=======================================
  Files         249      249           
  Lines       20256    20256           
=======================================
  Hits        20173    20173           
  Misses         83       83           

Impacted Files	Coverage Δ
pennylane/drawer/draw.py	100.00% <ø> (ø)
pennylane/drawer/tape_text.py	100.00% <ø> (ø)
pennylane/gradients/parameter_shift_hessian.py	100.00% <ø> (ø)
pennylane/queuing.py	100.00% <ø> (ø)
pennylane/templates/layer.py	100.00% <ø> (ø)
pennylane/templates/layers/random.py	100.00% <ø> (ø)
pennylane/templates/layers/strongly_entangling.py	100.00% <ø> (ø)
pennylane/templates/state_preparations/mottonen.py	100.00% <ø> (ø)
pennylane/templates/tensornetworks/mera.py	100.00% <ø> (ø)
pennylane/templates/tensornetworks/mps.py	100.00% <ø> (ø)
... and 12 more

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[AmintorDusko]

Hi @albi3ro, Looks good and I'm ready to approve. Could you please re-trigger the tests?
Something happened with it.

[AmintorDusko]

Nice work!