Clean up some markup cruft. A number of the macros that take no

parameters (like \UNIX) are commonly entered using an empty group to
separate the markup from a following inter-word space; this is not
needed when the next character is punctuation, or the markup is the
last thing in the enclosing group.  These cases were marked
inconsistently; the empty group is now *only* used when needed.

Doc/lib/libtelnetlib.tex

@@ -55,7 +55,7 @@ is closed and no cooked data is available.
 \end{methoddesc}
 
 \begin{methoddesc}{read_all}{}
-Read all data until \EOF{}; block until connection closed.
+Read all data until \EOF; block until connection closed.
 \end{methoddesc}
 
 \begin{methoddesc}{read_some}{}