Disclaimer for background region

[camipacifici]

Description

Added a sentence to the "aperture photometry" plugin docs to tell the user that only standard regions (created with "replace") are acceptable as background regions. Please double check that the link I added takes you here. I am not sure I got it right.

Checklist for package maintainer(s)

This checklist is meant to remind the package maintainer(s) who will review this pull request of some common things to look for. This list is not exhaustive.

• Are two approvals required? Branch protection rule does not check for the second approval. If a second approval is not necessary, please apply the trivial label.
• Do the proposed changes actually accomplish desired goals? Also manually run the affected example notebooks, if necessary.
• Do the proposed changes follow the STScI Style Guides?
• Are tests added/updated as required? If so, do they follow the STScI Style Guides?
• Are docs added/updated as required? If so, do they follow the STScI Style Guides?
• Did the CI pass? If not, are the failures related?
• Is a change log needed? If yes, is it added to CHANGES.rst?
• Is a milestone set?
• After merge, any internal documentations need updating (e.g., JIRA, Innerspace)?

[codecov]

Codecov Report

Merging #1589 (634f0e6) into main (4ee66f2) will not change coverage.
The diff coverage is n/a.

❗ Current head 634f0e6 differs from pull request most recent head e55f0bf. Consider uploading reports for the commit e55f0bf to get more accurate results

@@           Coverage Diff           @@
##             main    #1589   +/-   ##
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  Coverage   85.74%   85.74%           
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  Files          94       94           
  Lines        9290     9290           
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  Hits         7966     7966           
  Misses       1324     1324           

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[kecnry]

LGMT (see rendered docs)

[pllim]

LGTM too. Thanks!

Cami, if you have a JIRA ticket for this, pls update it accordingly after merge.

[pllim]

No need to wait for CI since this is only doc change. I will cancel CI and use admin override to merge.

[camipacifici]

There was no jira ticket, sorry.