fix some typos (#3587)

Signed-off-by: cuinix <915115094@qq.com>
Co-authored-by: Bastian Köcher <git@kchr.de>

polkadot/node/core/dispute-coordinator/src/initialized.rs

@@ -99,7 +99,7 @@ pub(crate) struct Initialized {
 	/// This is the highest `SessionIndex` seen via `ActiveLeavesUpdate`. It doesn't matter if it
 	/// was cached successfully or not. It is used to detect ancient disputes.
 	highest_session_seen: SessionIndex,
-	/// Will be set to `true` if an error occured during the last caching attempt
+	/// Will be set to `true` if an error occurred during the last caching attempt
 	gaps_in_cache: bool,
 	spam_slots: SpamSlots,
 	participation: Participation,

polkadot/node/core/pvf-checker/src/lib.rs

@@ -415,7 +415,7 @@ async fn check_signing_credentials(
 			gum::warn!(
 				target: LOG_TARGET,
 				relay_parent = ?leaf,
-				"error occured during requesting validators: {:?}",
+				"error occurred during requesting validators: {:?}",
 				e
 			);
 			return None
@@ -508,7 +508,7 @@ async fn sign_and_submit_pvf_check_statement(
 				target: LOG_TARGET,
 				?relay_parent,
 				?validation_code_hash,
-				"error occured during submitting a vote: {:?}",
+				"error occurred during submitting a vote: {:?}",
 				e,
 			);
 		},