Update pruning tooltip

This tooltip was a bit confusing and a deterrent more than informative. Can we adjust to something that fits a user looking for a way to save disk space?

Author: BitcoinErrorLog

src/qt/forms/optionsdialog.ui

@@ -55,7 +55,7 @@
         <item>
          <widget class="QCheckBox" name="prune">
           <property name="toolTip">
-           <string>Disables some advanced features but all blocks will still be fully validated. Reverting this setting requires re-downloading the entire blockchain. Actual disk usage may be somewhat higher.</string>
+           <string>>Enabling pruning significantly reduces the disk space required to verify transactions by removing some advanced features. Reverting this setting requires downloading the entire blockchain again.</string>
           </property>
           <property name="text">
            <string>Prune &amp;block storage to</string>