change: [M3-8509] - Add Pendo documentation to our development guide

[mjac0bs]

Description 📝

This PR creates some initial documentation for use of Pendo on Cloud Manager. See the internal doc for more details about access.

Changes 🔄

• Updated the https://linode.github.io/manager/tooling/analytics.html page of our developer docs
  • Page heading is now Analytics; Adobe and Pendo are subheaders
  • Section on Pendo has been added
• Updated a comment in the usePendo.js hook to better reflect the usage of the hook

Preview 📷

How to test 🧪

Verification steps

(How to verify changes)

• Read the diff or check out this PR locally and yarn docs, then go to http://localhost:5173/manager/tooling/analytics.html#pendo
• Confirm the documentation makes sense and confirm there are no typos.

As an Author I have considered 🤔

Check all that apply

• [ ] 👀 Doing a self review
• [ ] ❔ Our contribution guidelines
• [ ] 🤏 Splitting feature into small PRs
• [x] ➕ Adding a changeset
• [ ] 🧪 Providing/Improving test coverage
• [ ] 🔐 Removing all sensitive information from the code and PR description
• [ ] 🚩 Using a feature flag to protect the release
• [ ] 👣 Providing comprehensive reproduction steps
• [x] 📑 Providing or updating our documentation
• [ ] 🕛 Scheduling a pair reviewing session
• [ ] 📱 Providing mobile support
• [ ] ♿ Providing accessibility support