Fix other spelling issues.

doc/Guidebook.tex

@@ -1452,7 +1452,7 @@ be automatically turned off.
 \item[\tb{\#untrap}]
 Untrap something (trap, door, or chest). Default key is '{\tt M-u}', and '{\tt u}' if {\it number\verb+_+pad\/} is on.
 %.lp ""
-In some circumstancs it can also be used to rescue trapped monsters.
+In some circumstances it can also be used to rescue trapped monsters.
 %.lp
 \item[\tb{\#up}]
 Go up a staircase. Default key is '{\tt <}'.
@@ -1830,7 +1830,7 @@ The {\tt Ix} command shows an inventory-like display of any unpaid
 items which have been used up, along with other shop fees, if any.
 
 %.hn 3
-\subsubsection*{Shop idiosyncracies}
+\subsubsection*{Shop idiosyncrasies}
 
 %.pg
 Several aspects of shop behavior might be unexpected.
@@ -2848,23 +2848,23 @@ so setting HACKDIR to override that is not usually necessary or recommended.
 %.lp
 \item[\bb{LEVELDIR}]
 The location that in-progress level files are stored. Defaults to HACKDIR,
-must be writeable.
+must be writable.
 %.lp
 \item[\bb{SAVEDIR}]
 The location where saved games are kept. Defaults to HACKDIR, must be
-writeable.
+writable.
 %.lp
 \item[\bb{BONESDIR}]
 The location that bones files are kept. Defaults to HACKDIR, must be
-writeable.
+writable.
 %.lp
 \item[\bb{LOCKDIR}]
 The location that file synchronization locks are stored. Defaults to
-HACKDIR, must be writeable.
+HACKDIR, must be writable.
 %.lp
 \item[\bb{TROUBLEDIR}]
 The location that a record of game aborts and self-diagnosed game problems
-is kept. Defaults to HACKDIR, must be writeable.
+is kept. Defaults to HACKDIR, must be writable.
 %.lp
 \item[\bb{AUTOCOMPLETE}]
 Enable or disable an extended command autocompletion.