Remove moot data-toggle="tooltip" (#2861)

Tooltips need to be manually initialized which didn't happen.

Also, streamline tag indentation a bit

pages/examples/lockscreen.html

@@ -35,7 +35,9 @@
         <input type="password" class="form-control" placeholder="password">
 
         <div class="input-group-append">
-          <button type="button" class="btn"><i class="fas fa-arrow-right text-muted"></i></button>
+          <button type="button" class="btn">
+            <i class="fas fa-arrow-right text-muted"></i>
+          </button>
         </div>
       </div>
     </form>