[internet.reqmts.opt.mcast] Add hyphenation hint to fix overfull line

Author: jwakely

src/internetprotocol.tex

@@ -336,7 +336,7 @@
 \rSec2[internet.reqmts.opt.mcast]{Multicast group socket options}
 
 \pnum
-A type \tcode{X} meets the \tcode{MulticastGroupSocketOption} requirements if it satisfies the requirements of \tcode{Destructible} (\CppXref{destructible}), \tcode{CopyConstructible} (\CppXref{copyconstructible}), \tcode{CopyAssignable} (\CppXref{copyassignable}), and \tcode{SettableSocketOption}~(\ref{socket.reqmts.settablesocketoption}), as well as the additional requirements listed below.
+A type \tcode{X} meets the \tcode{MulticastGroupSocketOption} requirements if it satisfies the requirements of \tcode{Destruct\-ible} (\CppXref{destructible}), \tcode{CopyConstructible} (\CppXref{copyconstructible}), \tcode{CopyAssignable} (\CppXref{copyassignable}), and \tcode{SettableSocketOption}~(\ref{socket.reqmts.settablesocketoption}), as well as the additional requirements listed below.
 
 \pnum
 In the table below,