update delivery api content index instruction and images

[bkclerke]

updates to the instructions for rebuilding the delivery api content index and updated images

📋 Description

Updated the delivery api content index instructions and screenshots.

✅ Contributor Checklist

I've followed the Umbraco Documentation Style Guide and can confirm that:

• Code blocks are correctly formatted.
• Sentences are short and clear (preferably under 25 words).
• Passive voice and first-person language (“we”, “I”) are avoided.
• Relevant pages are linked.
• All links work and point to the correct resources.
• Screenshots or diagrams are included if useful.
• Any code examples or instructions have been tested.
• Typos, broken links, and broken images are fixed.

Product & Version (if relevant)

Version 16

[eshanrnh]

Thanks for the PR, @bkclerke 🙌 The PR looks great 💪

I have suggested a minor wording change for consistency.

[bkclerke]

Thanks @eshanrnh ! I added your updates and an additional typo fix for the same page. :)

[eshanrnh]

Looks good 🙌