Update dokka version, fix knowledge task

[williamito]

IMPORTANT: All PRs must be linked to an issue (except for extremely trivial and straightforward changes).

Fixes #2237

Description
Update dokka version, add missing configuration code to knowledge doc task.

Alternative(s) considered

Type
Choose one: Bug fix

Screenshots (if applicable)

Checklist

• I have read and acknowledged the Code of conduct.
• I have read the Contributing page.
• I have signed the Google Individual CLA, or I am covered by my company's Corporate CLA.
• I have discussed my proposed solution with code owners in the linked issue(s) and we have agreed upon the general approach.
• I have run ./gradlew spotlessApply and ./gradlew spotlessCheck to check my code follows the style guide of this project.
• I have run ./gradlew check and ./gradlew connectedCheck to test my changes locally.
• I have built and run the demo app(s) to verify my change fixes the issue and/or does not break the demo app(s).

[jingtang10]

@williamito - thanks for this. but can you please explain why we need to add the local directory and remote url info in the dokka config?

[vorburger]

@williamito thanks for this! Before we merge this, give me a few days to "test" this - I'll try something to build on top of my recent #2460 and #2461, to actually runs this, not locally, but directly on GitHub, hopefully some time in the next few days.

[jingtang10]

ok @vorburger i've disabled auto merge. but i'm fine with this being merged. so please feel free to.

[vorburger]

ok @vorburger i've disabled auto merge. but i'm fine with this being merged. so please feel free to.

I've now tested this as part of working on #2483 and seen that it works great, so I'm merging; thanks @williamito !

[vorburger]

This fails to auto-merge due to #2485. Either #2486 (if the team agrees) or a "real" fix of that problem will unblock it.

This is holding up #2483.