fix grammar

frontend/www/suggestworkout.html

@@ -33,7 +33,7 @@
       </div>
       <div class="row">
         <div class="col-lg">
-          <p class="mt-4 hide" id="description-no-athletes" >You can not suggest any workout since you have no registered athletes</p>
+          <p class="mt-4 hide" id="description-no-athletes" >You can not suggest a workout since you have no registered athletes</p>
         </div>
       </div>
       <form class="row g-3 mb-4" id="form-workout">