add canonical URL distributing caveat

[arsendovlatyan]

Related to #321

Description of the Change

Distributor plugin is modifying canonical URL of distributed post and pointing to original website. In some situations, for example when original post is in password-protected area, this behavior is unexpected.

Alternate Designs

I suggested to add an option in admin or hook, but @adamsilverstein suggests just remove applied filters and add a section in docs.

Benefits

Better documentation?

Possible Drawbacks

I don't see any

Verification Process

Ask colleagues to read the change. It's easy to understand.

Checklist:

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests passed.

Applicable Issues

None

[jeffpaul]

Looks good to me, thanks again @arsendovlatyan!

[adamsilverstein]

Thanks @arsendovlatyan - looks good to me, nice work!

@jeffpaul - I did notice when reviewing the text that we already use several distinct terms in the README to refer to distributed content - sometimes calling it "posts", sometimes "content" and sometimes "stories".

It might be worth creating a separate Issue to review and fine fine the language used here and in the plugin itself to make sure we are consistent.