fix sidebar typo

src/app/degree-planner/sidenav-menu-item/sidenav-menu-item.component.html

@@ -45,11 +45,11 @@
       <li>
         <i
           class="material-icons not-offered-icon"
-          matTooltip="Course no loger offered"
+          matTooltip="Course no longer offered"
           matTooltipPosition="left"
           >remove</i
         >
-        Course no loger offered
+        Course no longer offered
       </li>
     </ul>
   </mat-expansion-panel>