Fixed typo in description of main function snippet.

Fixed typo in description of main function snippet.

Author: CPPF0rev3r

snippets/cpp.json

@@ -269,6 +269,6 @@
 			"    return 0;",
 			"}"
 		],
-		"description": "Code snippet for 'for' loop"
+		"description": "Code snippet for main function"
 	}
 }