https://docs.python.org/3/library/multiprocessing.html#address-formats currently states

> An 'AF_PIPE' address is a string of the form r'\.\pipe{PipeName}'. To use Client() to connect to a named pipe on a remote computer called ServerName one should use an address of the form r'\ServerName\pipe{PipeName}' instead.

which suggests that if the pipe is named "foo", the string should be r'\.\pipe{foo}' (especially given that the other substituted string, ServerName, is given in italics... but actually the correct format is r'\.\pipe\foo'.

Hence I would suggest fixing the markup to give name formats as r'\.pipe\PipeName' where PipeName, is in italics, like ServerName.