yet another Guidebook update

A couple of \e to \\ changes, a whole bunch of ^ to \(ha changes
(similar character but bigger so easier to see), ~ to \(ti (ditto),
and - to \- (first is a hyphen, second is a minus sign which is
bigger; see the difference for "- and | The walls of a room...").

As well as horizontal walls, open doors, top and bottom of swallow
and explode octagons, I changed command line switches -s, -X, and -D
to use minus sign.  I was unsure whether the umpteen M-C should be
changed too.  Since it was less work to leave them as-is, that's
what I did.  I also left ^C with smaller circumflex punctation
instead of changing to bigger circumflex character for same reason.

The [much smaller] Guidebook.tex changes need testing.

Not fixed:
I think the sentence "you can type 'nethack -s all' on most versions"
is very misleading.  Using 'versions' to refer to the various ports
rather than different releases is iffy, but my complaint is that
"typing something" sounds like an action you would perform while in
the game.  Access to a command line and figuring out how to invoke
nethack from there is probably not something where "most versions"
applies any more.  But I don't know how to rephrase that succinctly.
If I did, I would have just changed it....

doc/Guidebook.tex

@@ -1028,7 +1028,7 @@ May be preceded by `{\tt m}' to force a selection menu.
 Toggle the {\it autopickup\/} option on and off.
 %.lp
 \item[\tb{\^{}}]
-Ask for the type of a trap you found earlier.
+Ask for the type of an adjacent trap you found earlier.
 %.lp
 \item[\tb{)}]
 Tell what weapon you are wielding.
@@ -1364,7 +1364,7 @@ List and reorder known spells. Default key is '{\tt +}'.
 Show the tools currently in use. Default key is '{\tt (}'.
 %.lp
 \item[\tb{\#seetrap}]
-Show the type of a trap near you. Default key is '{\tt \^{}}'.
+Show the type of an adjacent trap. Default key is '{\tt \^{}}'.
 %.lp
 \item[\tb{\#seeweapon}]
 Show the weapon currently wielded. Default key is '{\tt )}'.
@@ -4443,7 +4443,7 @@ file option. Symbols are specified as {\it name:value\/} pairs. Note that
 {\it NetHack\/} escape-processes the {\it value\/} string in conventional C
 fashion.  This means that `\verb+\+' is a prefix to take the following
 character literally.  Thus `\verb+\+' needs to be represented as `\verb+\\+'.
-The special escape form
+The special prefix
 `\verb+\m+' switches on the meta bit in the symbol value, and the
 `{\tt \^{}}' prefix causes the following character to be treated as a control
 character.
@@ -4632,7 +4632,18 @@ Default                      & Symbol Name                & Description\\
 \end{longtable}%
 }
 
-%.lp
+%.pg
+There is one additional class of object, described as ``strange object'',
+which will occasionally be the shape taken on by mimics and shown as
+`{\tt \verb+]+}'
+for maps displayed as text characters.
+Although the displayed character is the same as the default value for
+`S\verb+_+mimic\verb+_+def', it is a different symbol and there is no
+corresponding
+`S\verb+_\+strange\verb+_+object' symbol nor any way to assign an
+alternate value for it.
+
+%.pg
 %.hn 2
 \subsection*{Configuring {\it NetHack\/} for Play by the Blind}