docs: corrected grammar in about.html (#5194)

* corrected grammar in about.html

I made grammar corrections as what was there wasn't sounding right

* Update about.html

frontend/src/html/pages/about.html

@@ -20,7 +20,7 @@
         aria-label=""
         data-balloon-pos="up"
       >
-        <div class="label">total started tests</div>
+        <div class="label">total tests started</div>
         <div class="val">-</div>
         <div class="valSmall">-</div>
       </div>
@@ -30,7 +30,7 @@
         aria-label=""
         data-balloon-pos="up"
       >
-        <div class="label">total time typing</div>
+        <div class="label">total typing time</div>
         <div class="val">-</div>
         <div class="valSmall">-</div>
       </div>
@@ -40,7 +40,7 @@
         aria-label=""
         data-balloon-pos="up"
       >
-        <div class="label">total completed tests</div>
+        <div class="label">total tests completed</div>
         <div class="val">-</div>
         <div class="valSmall">-</div>
       </div>
@@ -80,7 +80,7 @@ <h2>
       You can use
       <key>tab</key>
       and
-      <key>enter</key>
+      <key>enter</key> 
       (or just
       <key>tab</key>
       if you have quick tab mode enabled) to restart the typing test. Open the