v2026.03.16.00

Fix typo "occured" to "occurred" in comment at...

Summary:
- Fix typo "occured" to "occurred" in comment at watchman/watcher/eden.cpp describing changes computation.
- Fix typo "occured" to "occurred" in doc comment at watchman/rust/watchman_client/src/pdu.rs describing hash error enum variant.
- Fix typo "wether" to "whether" in comment at watchman/query/eval.cpp describing merge base update condition.

AI Review:
- security: PASSED (1.00) — These changes are purely comment/documentation typo fixes ("occured" → "occurred", "wether" → "whether") with zero impact on code logic, control flow, or data handling. No security concerns.
- quality: PASSED (1.00) — All three changes are pure comment/documentation typo fixes ("occured" → "occurred", "wether" → "whether"). No code logic, function signatures, return values, or behavior is modified. These changes cannot break any callers or dependent code.
- task_solution: PASSED (1.00) — All three typo corrections are exactly as specified, touching only comments/doc comments with no code changes. No risk of regressions.

Reviewed By: dtolnay

Differential Revision: D96712065

fbshipit-source-id: 86c960378d77f1bac84592a89fcc67d48561f932