Fix typo: ambigious -> ambiguous (#4380)

* Do not log PVF prunning every hour

This lowers the level of the PVF pruning.

Closes https://github.com/paritytech/polkadot/issues/4361

* Fix typo: ambigious -> ambiguous

The correct spelling is ambiguous
([dictionary](https://dictionary.cambridge.org/dictionary/english/ambiguous))

polkadot/node/core/pvf/src/execute/queue.rs

@@ -240,7 +240,7 @@ fn handle_job_finish(
 		Outcome::HardTimeout =>
 			(None, Err(ValidationError::InvalidCandidate(InvalidCandidate::HardTimeout))),
 		Outcome::IoErr =>
-			(None, Err(ValidationError::InvalidCandidate(InvalidCandidate::AmbigiousWorkerDeath))),
+			(None, Err(ValidationError::InvalidCandidate(InvalidCandidate::AmbiguousWorkerDeath))),
 	};
 
 	queue.metrics.execute_finished();