fix up some syntax errors in Guidebook.tex

doc/Guidebook.tex

@@ -863,7 +863,7 @@ the exchange still takes place.
 %.lp
 \item[\tb{X}]
 Toggle two-weapon combat, if your character can do it.  Also available
-via the ``#twoweapon'' extended command
+via the ``{\tt \#twoweapon}'' extended command
 %.lp
 \item[\tb{\^{}X}]
 Display basic information about your character.\\
@@ -3564,7 +3564,7 @@ There are two ways of enabling explore mode.  One is to start the game
 with the {\tt -X}
 command-line switch or with the
 {\it playmode:explore\/}
-option.  The other is to issue the `{\tt #exploremode}' extended command while
+option.  The other is to issue the `{\tt \#exploremode}' extended command while
 already playing the game.  Starting a new game in explore mode provides your
 character with a wand of wishing in initial inventory; switching
 during play does not.  The other benefits of explore mode are left for
@@ -3929,12 +3929,11 @@ people primarily responsible for the public NetHack servers available for
 playing the game at nethack.alt.org and devnull.net. In addition to providing 
 a way for the public to play a game of NetHack from almost anywhere, they 
 have hosted annual NetHack tournaments for many, many years. 
-%pg 
-\medskip
+%.pg 
 \nd On behalf of the NetHack community, thank you very much to 
 {\it M. Drew Streib}, {\it Pasi Kallinen} and {\it Robin Bandy}.
 
-.pg
+%.pg
 %.hn 3
 \subsection*{Dungeoneers}
 \bigskip