Added timeout parameter to docstring of socket_write() function.

Author: BiffoBear

adafruit_wiznet5k/adafruit_wiznet5k.py

@@ -964,6 +964,8 @@ def socket_write(
 
         :param int socket_num: The socket to write to.
         :param bytearray buffer: The data to write to the socket.
+        :param float timeout: Write data timeout in seconds, defaults to 0.0 which waits
+            indefinitely.
 
         :return int: The number of bytes written to the buffer.
         """