Updating secret management page

[Musealali]

Adding more information regarding the secret limits in the cloud portal.

📋 Description

Added more information under this page: https://docs.umbraco.com/umbraco-cloud/begin-your-cloud-journey/project-features/secrets-management

The information is about the max limit of the secrets being added.

📎 Related Issues (if applicable)

✅ Contributor Checklist

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

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

Product & Version (if relevant)

Umbraco Cloud Portal

Deadline (if relevant)

📚 Helpful Resources

• 🧾 Umbraco Contribution Guidelines
• ✍️ Umbraco Documentation Style Guide

[eshanrnh]

Thanks for the PR, @Musealali 🙌 The PR looks great. I have added a small suggestion to remove We.