fix 2 typos

IPython/frontend/html/notebook/static/js/codecell.js

@@ -254,7 +254,7 var IPython = (function (IPython) {
             if(this.npressed >fallback_on_tooltip_after  && this.prevmatch==matched_text)
             {
                 console.log('Ok, you really want to complete after pressing tab '+this.npressed+' times !');
-                console.log('You should undersand that there is no (more) completion for that !');
+                console.log('You should understand that there is no (more) completion for that !');
                 console.log("I'll show you the tooltip, will you stop bothering me ?");
                 this.request_tooltip_after_time(matched_text+'(',0,this);
                 return;

IPython/frontend/html/notebook/static/js/panelsection.js

@@ -134,7 +134,7 var IPython = (function (IPython) {
         this.content.addClass('ui-helper-clearfix');
         this.content.find('div.section_row').addClass('ui-helper-clearfix');
 
-        this.content.find('#tooltipontab').attr('title', 'Show tooltip if yuo press <Tab> after "(" or a white space');
+        this.content.find('#tooltipontab').attr('title', 'Show tooltip if you press <Tab> after "(" or a white space');
         this.content.find('#tooltipontab_label').attr('title', 'Show Tooltip when pressing Tab');
 
         this.content.find('#timebeforetooltip').attr('title', 'Time before a tooltip auto-appear when "(" is pressed (negative value supress tooltip)');