Add Dark Mode CSS Style for CSRF and Method Security diagrams

[harpreets789]

This pull request resolves issue #16151 by addressing the dark mode rendering issues on the Cross Site Request Forgery (CSRF) and Method Security documentation pages.

Changes:

• Added the [.invert-dark] attribute to the .adoc files for the affected pages.
• Ensured that images now render clearly in both light and dark modes by applying the dark mode CSS styles.

These changes provide a consistent and improved user experience across themes. Feedback and suggestions are welcome!

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[jzheaux]

Hi, @harpreets789, thanks for the fix. Since this occurs in the 6.2.x documentation as well, could you please rebase your PR on 6.2.x? It may also help for you to submit using a PR branch like gh-16151.

Would you also please format your commit so that the ticket is in the body of the commit instead of the title? Something similar to this would be great:

Polish Dark Mode for CSRF and Method Security diagrams

Closes gh-16151

[harpreets789]

@jzheaux Thank you for the feedback! I’ll rebase the PR onto the 6.2.x branch and update the commit message as suggested. I’ll also use a new branch (gh-16151) for the submission. Appreciate your guidance!

[harpreets789]

Hi, @jzheaux I've created a new branch, gh-16151, rebased on the 6.2.x branch as requested. The changes from this PR have been incorporated into the new branch. A new PR has been opened to reflect these updates: #16166. Please review the new PR. Thank you!

[sjohnr]

Closing in favor of gh-16166.