docs: Correct post commands typos and spelling errors (#2430)

## Why is this change needed?

Describe why this issue should be fixed and link to any relevant design
docs, issues or other relevant items.

## Merge Checklist

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- [ ] PR title adheres to the [conventional
commits](https://www.conventionalcommits.org/en/v1.0.0/) standard
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[changeset](https://github.com/farcasterxyz/hub-monorepo/blob/main/CONTRIBUTING.md#35-adding-changesets)
- [ ] PR has been tagged with a change label(s) (i.e. documentation,
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<!-- start pr-codex -->

---

## PR-Codex overview
This PR focuses on correcting a typo in the comment of the
`syncEngine.test.ts` file and ensuring that the test expectations
regarding the synchronization functionality are clearly articulated.

### Detailed summary
- Corrected the typo in the comment from "becuase" to "because".
- Confirmed that the `result.successCount` is expected to equal `1`.
- Verified that `oldSnapshot.excludedHashes` does not equal the excluded
hashes from the new snapshot.
- Checked that the `shouldSync` status from `syncEngine.syncStatus` is
truthy.

> ✨ Ask PR-Codex anything about this PR by commenting with `/codex {your
question}`

<!-- end pr-codex -->

apps/hubble/src/network/sync/syncEngine.test.ts

@@ -382,7 +382,7 @@ describe("SyncEngine", () => {
     const result = await syncEngine.mergeMessages([castAdd], rpcClient);
     expect(result.successCount).toEqual(1);
 
-    // Should sync should return true becuase the excluded hashes don't match
+    // Should sync should return true because the excluded hashes don't match
     expect(oldSnapshot.excludedHashes).not.toEqual((await syncEngine.getSnapshot())._unsafeUnwrap().excludedHashes);
     expect((await syncEngine.syncStatus("test", oldSnapshot))._unsafeUnwrap().shouldSync).toBeTruthy();