Fixed small doc typo

code/html/index.html

@@ -955,7 +955,7 @@
                                     <div class="pure-u-1 pure-u-sm-1-4"><input type="checkbox" name="pwrResetCalibration" tabindex="59" /></div>
                                     <div class="pure-u-0 pure-u-md-1-2">&nbsp;</div>
                                     <div class="pure-u-0 pure-u-md-1-4">&nbsp;</div>
-                                    <div class="pure-u-1 pure-u-md-3-4 hint">Move this switch to ON and press "Update" to revert to factory calibration values.</div>
+                                    <div class="pure-u-1 pure-u-md-3-4 hint">Move this switch to ON and press "Save" to revert to factory calibration values.</div>
                                 </div>
 
                                 <!--