Remove bogus \@.

Doc/mac/libmactcp.tex

@@ -7,7 +7,7 @@
 
 
 This module provides an interface to the Macintosh TCP/IP driver%
-\index{MacTCP} MacTCP\@. There is an accompanying module,
+\index{MacTCP} MacTCP. There is an accompanying module,
 \module{macdnr}\refbimodindex{macdnr}, which provides an interface to
 the name-server (allowing you to translate hostnames to IP addresses),
 a module \module{MACTCPconst}\refstmodindex{MACTCPconst} which has