[5189] Couple minor comment improvements.

src/lib/asiolink/tests/unix_domain_socket_unittest.cc

@@ -170,7 +170,8 @@ TEST_F(UnixDomainSocketTest, asyncSendReceive) {
     // some data have been sent.
     ASSERT_GT(sent_size, 0);
 
-    // Receive response from the socket.
+    // Receive response from the socket. Very small receive buffer ensures that
+    // we will read the response in chunks.
     std::array<char, 2> read_buf;
     size_t bytes_read = 0;
     std::string response;

src/lib/asiolink/testutils/test_server_unix_socket.h

@@ -72,6 +72,8 @@ public:
 
     /// @brief Generates response of a given length.
     ///
+    /// Note: The response may be a few bytes larger than requested.
+    ///
     /// @param response_size Desired response size.
     void generateCustomResponse(const uint64_t response_size);
 

src/lib/asiolink/unix_domain_socket.cc

@@ -50,7 +50,7 @@ public:
     /// necessarily indicate a problem and the subsequent attempts to read
     /// and write to the socket will succeed. Therefore, the handler simply
     /// overrides this error code with success status. The user supplied
-    /// handler don't need to deal with the EINPROGRESS error codes.
+    /// handler doesn't need to deal with the EINPROGRESS error codes.
     ///
     /// @param remote_handler User supplied callback.
     /// @param ec Error code returned as a result of connection.