Added monitors information to 1Password app doc

[JV0812]

Purpose of this pull request

This pull request is to add monitors and its respective alerts details to 1Password app doc.

Select the type of change

• [ ] Minor Changes - Typos, formatting, slight revisions
• [ ] Update Content - Revisions, updating sections
• [x] New Content - New features, sections, pages, tutorials
• [ ] Site and Tools - .clabot, version updates, maintenance, dependencies, new packages for the site (Docusaurus, Gatsby, React, etc.)

Ticket (if applicable)

Update the doc for the existing 1Password App

[JV0812]

Thanks for your feedback @jpipkin1. I have fixed your comments.

[jpipkin1]

I am merging the PR at the request of @ankitgoelcmu.