fix: typo for execution client notifications subscription page header

Author: igorline

src/app/pages/clients/clients.page.html

@@ -7,7 +7,7 @@
 		</ion-buttons>
 		<span [ngSwitch]="clientIdentifier">
 			<span *ngSwitchCase="'eth1Clients'">
-				<ion-title>Excecution Clients</ion-title>
+				<ion-title>Execution Clients</ion-title>
 			</span>
 			<span *ngSwitchCase="'eth2Clients'">
 				<ion-title>Consensus Clients</ion-title>