Updates to UXP API reference

[padmkris123]

Updated API reference as of UXP v6.3

Description

Changes from latest UXP source files that contain changes upto UXP v6.3

Related Issue

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] I have signed the Adobe Open Source CLA.
• [x] My code follows the code style of this project.
• [x] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[pklaschka]

I have resolved all the "data type normalization" review comments. The remaining comments fall into a few categories with varying severity (🔴 blocking: I wouldn't want to merge this PR with these issues remaining; 🟡 needs to be fixed as soon as possible, but not necessarily right now; and 🟢 nice-to-have)

🔴 : Wrong/misleading/confusing information (wrong return type, wrong parameter type) 🔴 : Duplicate source of truth (we shouldn't (without explaining comments) include both storage.md and the original files at the same time 🔴 : Encoding issues in files => this could break the page 🔴 🟡 : (things where I couldn't decide if they should be red and yellow are marked as such in the PR comments) 🟡 : missing information (missing types, etc.) 🟢 : cosmetic changes