Update documentation contribution link

[laurelmay]

Committer Notes

The current "Improve this Page" link at the bottom of each page results in a GitHub 404 error.

All Submissions:

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Have you squashed any non-relevant commits and commit messages? [instructions]
• Do all automated CI/CD checks pass?

Changes to Core Features:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your core changes, as applicable?
• Have you included examples of how to use your new feature(s)?
• Have you updated all OSCAL website and readme documentation affected by the changes you made? Changes to the OSCAL website can be made in the docs/content directory of your branch.

[iMichaela]

The submitted change was reviewed and is correct. I am not approving the PR because we need to make sure the error does not have a deeper root - need to talk to @david-waltermire-nist. The link worked in the past and most likely was changed pointing incorrectly to oscal-content repo instead of OSCAL (docs/content) when the OSCAL content was moved to its own repo ( oscal-content repo).

[david-waltermire]

@kylelaker I believe this is used in some pages to point to OSCAL content repository. I need to check if this change has other side effects as a result.

[david-waltermire]

This was merged with some modifications.