Fix typos in comments.

atom/browser/api/lib/menu.js

@@ -7,7 +7,7 @@ const bindings = process.atomBinding('menu');
 // Automatically generated radio menu item's group id.
 var nextGroupId = 0;
 
-// Search between seperators to find a radio menu item and return its group id,
+// Search between separators to find a radio menu item and return its group id,
 // otherwise generate a group id.
 var generateGroupId = function(items, pos) {
   var i, item, j, k, ref1, ref2, ref3;

atom/browser/atom_browser_main_parts.h

@@ -31,7 +31,7 @@ class AtomBrowserMainParts : public brightray::BrowserMainParts {
 
   static AtomBrowserMainParts* Get();
 
-  // Sets the exit code, will fail if the the message loop is not ready.
+  // Sets the exit code, will fail if the message loop is not ready.
   bool SetExitCode(int code);
 
   // Gets the exit code

atom/browser/ui/views/global_menu_bar_x11.h

@@ -40,7 +40,7 @@ class GlobalMenuBarX11 {
   explicit GlobalMenuBarX11(NativeWindowViews* window);
   virtual ~GlobalMenuBarX11();
 
-  // Creates the object path for DbusemenuServer which is attached to |xid|.
+  // Creates the object path for DbusmenuServer which is attached to |xid|.
   static std::string GetPathForWindow(gfx::AcceleratedWidget xid);
 
   void SetMenu(ui::MenuModel* menu_model);