Copy & Paste existing docs

[schmidt-sebastian]

This is a dumb copy and paste PR that moves the existing Firestore docs to the firestore-exp APIs with no edits. Edits will follow in a follow-up PR.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 9a66285

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.

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[google-oss-bot]

Size Analysis Report

Affected Products

No changes between base commit (80e4219) and head commit (8052d3f).

Test Logs

• Base (80e42190): https://github.com/firebase/firebase-js-sdk/actions/runs/257860771
• Head (8052d3f8): https://github.com/firebase/firebase-js-sdk/actions/runs/257931207

[google-oss-bot]

Binary Size Report

Affected SDKs

No changes between base commit (b61f0d7) and head commit (6bec224).

Test Logs

• Base (b61f0d7d): https://github.com/firebase/firebase-js-sdk/actions/runs/270929071
• Head (6bec224a): https://github.com/firebase/firebase-js-sdk/actions/runs/271474759