Update reference doc generation

[Feiyang1]

Changes:

1. show table of functions first in the overview pages
2. generate toc items only for entry points

[changeset-bot]

⚠️ No Changeset found

Latest commit: a076fed

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[github-actions]

Changeset File Check ⚠️

• Changeset formatting error in following file:

  Package "firebase-compat-typings-test" must depend on the current version of "firebase-exp": "9.0.0-beta.8" vs "file:../../packages-exp/firebase-exp"
  Package "firebase-compat-typings-test" must depend on the current version of "firebase-exp": "9.0.0-beta.8" vs "file:../../packages-exp/firebase-exp"
  Package "firebase-compat-typings-test" must depend on the current version of "firebase-exp": "9.0.0-beta.8" vs "file:../../packages-exp/firebase-exp"
  Some packages have been changed but no changesets were found. Run `changeset add` to resolve this error.
  If this change doesn't need a release, run `changeset add --empty`.
  

[google-oss-bot]

Binary Size Report

Affected SDKs

No changes between base commit (4d747b1) and head commit (eb76e59).

Test Logs

• Base (4d747b15): https://github.com/firebase/firebase-js-sdk/actions/runs/1148827563
• Head (eb76e594): https://github.com/firebase/firebase-js-sdk/actions/runs/1149694234

[google-oss-bot]

Size Analysis Report

Affected Products

No changes between base commit (4d747b1) and head commit (eb76e59).

Test Logs

• Base (4d747b1): https://github.com/firebase/firebase-js-sdk/actions/runs/1148827563
• Head (eb76e59): https://github.com/firebase/firebase-js-sdk/actions/runs/1149694234