test: update doc in code

Author: tony-go

src/api/encoding.cc

@@ -3,6 +3,8 @@
 #include "util-inl.h"
 #include "v8.h"
 
+using namespace std;
+
 namespace node {
 
 using v8::HandleScope;
@@ -16,8 +18,8 @@ enum encoding ParseEncoding(const char* encoding,
     case 'u':
     case 'U':
       // Note: the two first conditions are needed for performance reasons
-      // as "utf8"/"utf-8" is a common case
-      // (same for "utf16le/utf-16le" and "ucs2/ucs-2").
+      // as "utf8"/"utf-8" is a common case.
+      // (same for other cases below)
 
       // utf, utf16le
       if (encoding[1] == 't' && encoding[2] == 'f') {