make singular

Author: cmontella

v0.3/handbook/libraries/stdlib.md

@@ -1425,12 +1425,12 @@ The system library provides various system-level utilities for Eve.
         <li><strong>month</strong> - (optional) - the current month (1 - 12)</li>
         <li><strong>day</strong> - (optional) - the current day of the month (1 - 31)</li>
         <li><strong>weekday</strong> - (optional) - the current day of the week (1 - 7, where 1 is Sunday)</li>
-        <li><strong>hours</strong> - (optional) - the current hour (0 - 23)</li>
-        <li><strong>minutes</strong> - (optional) - the current minute (0 - 59)</li>
-        <li><strong>seconds</strong> - (optional) - the current second (0 - 59)</li>
-        <li><strong>milliseconds</strong> - (optional) - the current millisecond (0 - 999)</li>
+        <li><strong>hour</strong> - (optional) - the current hour (0 - 23)</li>
+        <li><strong>minute</strong> - (optional) - the current minute (0 - 59)</li>
+        <li><strong>second</strong> - (optional) - the current second (0 - 59)</li>
+        <li><strong>millisecond</strong> - (optional) - the current millisecond (0 - 999)</li>
         <li><strong>timestamp</strong> - (optional) - the current time represented as the number of milliseconds elapsed since 1 January 1970 00:00:00 UTC</li>
-        <li><strong>ticks</strong> - (optional) - the number of ticks of the timer since it was created</li>
+        <li><strong>tick</strong> - (optional) - the number of ticks of the timer since it was created</li>
       </ul>
     </td>
     <td>