Fix typo: cheked -> checked

Author: changeworld

docs/snippets/cpp/VS_Snippets_Winforms/TreeNode_ForeColor/CPP/treenode_forecolor.cpp

@@ -203,7 +203,7 @@ public ref class MyTreeNode_FirstNode: public Form
       else
       {
 
-         // If the check box is not cheked, collapse the first tree node.
+         // If the check box is not checked, collapse the first tree node.
          myTreeView->Nodes[ 0 ]->FirstNode->Collapse();
          MessageBox::Show( "The first and last  node of CutomerList root node is collapsed" );
       }