Class docs

[ajberdy]

Issue #, if available:

Description of changes:

Add class docstring to circuit subroutines

Testing done:

docs inspection

Merge Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your pull request.

General

• [x] I have read the CONTRIBUTING doc
• [x] I used the commit message format described in CONTRIBUTING
• [x] I have updated any necessary documentation, including READMEs and API docs (if appropriate)

Tests

• [x] I have added tests that prove my fix is effective or that my feature works (if appropriate)
• [x] I have checked that my tests are not configured for a specific region or account (if appropriate)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov[bot]]

Codecov Report

:x: Patch coverage is 97.87234% with 1 line in your changes missing coverage. Please review. :white_check_mark: Project coverage is 99.98%. Comparing base (10f4995) to head (1539c8f). :warning: Report is 423 commits behind head on main.

Files with missing lines	Patch %	Lines
src/braket/circuits/gates.py	97.87%	0 Missing and 1 partial :warning:

Additional details and impacted files

@@             Coverage Diff             @@
##              main     #801      +/-   ##
===========================================
- Coverage   100.00%   99.98%   -0.02%     
===========================================
  Files          129      129              
  Lines         8360     8406      +46     
  Branches      1862     1901      +39     
===========================================
+ Hits          8360     8405      +45     
- Partials         0        1       +1     

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[speller26]

Took a different route for solving the issue