Replace single- with double-quote for docstrings, as per PEP-257

[fgebhart]

Related Issue(s):

Closes #319

Proposed Changes:

For inclusion in changelog (if applicable):

1. Replacement of all single quotes by double quotes in docstrings.

Not intended for changelog:

1. This PR replaces all occurrences of ''' with """ in order to comply with PEP-257 as outlined in change docstrings to triple quotes #319

Diff of User Interface

Old behavior: No diff

New behavior: No diff

PR Checklist:

• This PR is as small and focused as possible
• If this PR includes proposed changes for inclusion in the changelog, the title of this PR summarizes those changes and is ready for inclusion in the Changelog.
• I have updated docstrings for function changes and docs in the 'docs' folder for user interface / behavior changes
• This PR does not break any examples or I have updated them

(Optional) @mentions for Notifications:

Remark
I was looking for a small/easy issue to start with and found #319. However, after browsing through the code base, I couldn't find any docstrings that used only a single (opposed of triple) quote (please let me know if there are yet any and I simply overlooked them). Thus, technically the description of #319:

docstrings should use triple-quotes

is already fulfilled. However PEP-257 requires triple-double quotes

always use """triple double quotes""" around docstrings

which is why I took the liberty to tackle this exact specification in the scope of the linked issue. Basically, all I did was to find and replace ''' with """ throughout the code base.

Note, I would totally understand if you do not want to take care of such a cosmetic change.

Please review with care, as this is my first contribution to this repo. Thanks!

[sgillies]

Thank you @fgebhart ! I couldn't find any sign of non-triple quotes used for docstrings, so my interpretation of the intent of #319 is "change docstrings to triple double-quotes".

I've switched the target branch to main.