Supplement annotations.

include/ascs/ext/ext.h

@@ -52,10 +52,10 @@ public:
 	virtual const char* data() const {return std::string::data();}
 };
 
-//a substitute of std::string (just for unpacking scenario, many features are missing according to std::string), because std::string
+//a substitute of std::string (just for unpacking scenario, many features are missing against std::string), because std::string
 // has a small defect which is terrible for unpacking scenario, it cannot change its size without fill its buffer.
-//please note that basic_buffer won't append '\0' to the end of the string (std::string will do), you cannot treat it as a string and
-// print it with "%s" format even all characters in it are printable (because no '\0' appended to them).
+//please note that basic_buffer won't append '\0' to the end of the string (std::string will do), you must appen '\0' characters
+// by your own if you want to print it via "%s" formatter, e.g. basic_buffer("123", 4), bb.append("abc", 4).
 class basic_buffer
 #if defined(_MSC_VER) && _MSC_VER <= 1800
 	: public asio::noncopyable

include/ascs/ext/unpacker.h

@@ -176,7 +176,7 @@ protected:
 
 //protocol: length + body
 //this unpacker has a fixed buffer (4000 bytes), if messages can be held in it, then this unpacker works just as the default unpacker,
-// otherwise, a dynamic std::string will be created to hold big messages, then this unpacker works just as the non_copy_unpacker.
+// otherwise, a dynamic T will be created to hold big messages, then this unpacker works as the non_copy_unpacker.
 //T can be std::string or basic_buffer, the latter will not fill its buffer in resize invocation, so is more efficient.
 template<typename T = basic_buffer>
 class flexible_unpacker : public i_unpacker<T>