Merge pull request #162 from SenecaCDOT-BigBlueButton/add-help-link-tooltip

added tooltip to help link

bigbluebutton-client/src/org/bigbluebutton/main/views/MainToolbar.mxml

@@ -246,7 +246,8 @@ with BigBlueButton; if not, see <http://www.gnu.org/licenses/>.
              toolTip="{ResourceUtil.getInstance().getString('bbb.mainToolbar.shortcutBtn.toolTip')}" 
              tabIndex="{baseIndex+numButtons+6}" />
 	<mx:LinkButton id="helpBtn" visible="{showHelpBtn}" label="?" click="onHelpButtonClicked()" height="22" 
-                   styleName="helpLinkButtonStyle" tabIndex="{baseIndex+numButtons+7}" />
+                   styleName="helpLinkButtonStyle" tabIndex="{baseIndex+numButtons+7}" 
+                   toolTip="{ResourceUtil.getInstance().getString('bbb.mainToolbar.helpBtn')}"/>
 	<mx:Button label="" id="btnLogout" styleName="logoutButtonStyle"
                  toolTip="{ResourceUtil.getInstance().getString('bbb.mainToolbar.logoutBtn.toolTip')}" right="10" click="doLogout()" height="22"
                  tabIndex="{baseIndex+numButtons+8}" />