Guidebook update: "Map (rest of screen)"

The description of the default map display was out of date:

Sinks aren't conditional anymore, and were changed from '#' to '{'.
Statues were still listed as '`' but aren't displayed as that.
Room and corridor engravings weren't mentioned.
Wall of water and wall of lava weren't mentioned.
Drawbridge portcullis ('#' when closed) and span ('.' when open)
weren't mentioned.

This splits introductory "- and |" into two entries.

I've forced CR font (similar to TeX's tt font) for the initial
character of all the entries.

The formatting of letters for monsters left something to be desired
so I've tried to redo it.  The 'roff edition seems ok (as least when
there's no page break in the middle of it) but I'm not sure how the
LaTeX version will fare.  I didn't try to include the trailing "and"
on the first two lines the way the 'roff version does since I wasn't
sure how to accomplish that.

doc/Guidebook.mn

@@ -46,7 +46,7 @@
 .ds f0 \*(vr
 .ds f1 \" empty
 .\"DO NOT REMOVE NH_DATESUB .ds f2 DATE(%B %-d, %Y)
-.ds f2 April 12, 2024
+.ds f2 July 16, 2024
 .
 .\" A note on some special characters:
 .\" \(lq = left double quote
@@ -455,69 +455,84 @@ option.
 The map (rest of the screen)
 .pg
 The rest of the screen is the map of the level as you have explored it
-so far.  Each symbol on the screen represents something.  You can set
-various graphics options to change some of the symbols the game uses;
-otherwise, the game will use default symbols.  Here is a list of what the
-default symbols mean:
-.lp "\\- and | "
-The walls of a room, or an open door.  Or a grave (|).
-.lp .
-The floor of a room, ice, or a doorless doorway.
-.lp #
-A corridor, or iron bars, or a tree, or possibly a kitchen sink (if
-your dungeon has sinks), or a drawbridge.
-.lp >
+so far.
+Each symbol on the screen represents something.
+You can set various graphics options to change some of the symbols the
+game uses; otherwise, the game will use default symbols.
+Here is a list of what the default symbols mean:
+.lp \f(CR\\-\fP
+The horizontal or corner walls of a room, or an open east/west door.
+.lp \f(CR|\fP
+The vertical walls of a room, or an open north/south door, or a grave.
+.lp \f(CR.\fP
+The floor of a room, or ice, or a doorless doorway, or the span of an
+open drawbridge.
+.lp \f(CR#\fP
+A corridor, or iron bars, or a tree, or the portcullis of a closed
+drawbridge.
+.lp ""
+Note: engravings in corridors also appear as \f(CR#\fP but are shown in
+a different color from normal corridor locations.
+.lp \f(CR>\fP
 Stairs down: a way to the next level.
-.lp <
+.lp \f(CR<\fP
 Stairs up: a way to the previous level.
-.lp +
+.lp \f(CR+\fP
 A closed door, or a spellbook containing a spell you may be able to learn.
-.lp @
-Your character or a human.
-.lp $
+.lp \f(CR@\fP
+Your character or a human or an elf.
+.lp \f(CR$\fP
 A pile of gold.
-.lp \(ha \" ^
+.lp \f(CR\(ha\fP \" \(ah == 'hat' == circumflex accent == caret ^
 A trap (once you have detected it).
-.lp )
+.lp \f(CR)\fP
 A weapon.
-.lp [
+.lp \f(CR[\fP
 A suit or piece of armor.
-.lp %
+.lp \f(CR%\fP
 Something edible (not necessarily healthy).
-.lp ?
+.lp \f(CR?\fP
 A scroll.
-.lp /
+.lp \f(CR/\fP
 A wand.
-.lp =
+.lp \f(CR=\fP
 A ring.
-.lp !
+.lp \f(CR!\fP
 A potion.
-.lp (
+.lp \f(CR(\fP
 A useful item (pick-axe, key, lamp...).
-.lp \(dq \" \(dq == double quote
+.lp \f(CR\(dq\fP \" \(dq == double quote
 An amulet or a spider web.
-.lp *
+.lp \f(CR*\fP
 A gem or rock (possibly valuable, possibly worthless).
-.lp \`
-A boulder or statue.
-.lp 0
+.lp \f(CR\`\fP
+A boulder or statue or an engraving on the floor of a room.
+.lp ""
+Note: statues are displayed as if they were the monsters they depict
+so won't appear as a \fIgrave accent\fP (aka \fIback-tick\fP).
+.lp \f(CR0\fP
 An iron ball.
-.lp _
+.lp \f(CR_\fP
 An altar, or an iron chain.
-.lp {
-A fountain.
-.lp }
-A pool of water or moat or a pool of lava.
-.lp \\\\
+.lp \f(CR{\fP
+A fountain or a sink.
+.lp \f(CR}\fP
+A pool of water or moat or a wall of water
+or a pool of lava or a wall of lava.
+.lp \f(CR\\\\\fP
 An opulent throne.
-.lp "a-zA-Z and other symbols"
+.lp "\f(CRa\fP-\f(CRz\fP\ \ \fIand\fP"
+.lp "\f(CRA\fP-\f(CRZ\fP\ \ \fIand\fP"
+.lp "\f(CR@&\(aq\fP" \" \(aq == apostrophe / single quote
 Letters and certain other symbols represent the various inhabitants
-of the Mazes of Menace.  Watch out, they can be nasty and vicious.
+of the Mazes of Menace.
+Watch out, they can be nasty and vicious.
 Sometimes, however, they can be helpful.
-.lp I
-This marks the last known location of an invisible or otherwise unseen
-monster.  Note that the monster could have moved.
-The \(oqF\(cq and \(oqm\(cq commands may be useful here.
+.lp \f(CRI\fP
+Rather than a specific type of monster, this marks the last known
+location of an invisible or otherwise unseen monster.
+Note that the monster could have moved.
+The \(oqs\(cq, \(oqF\(cq, and \(oqm\(cq commands may be useful here.
 .pg
 You need not memorize all these symbols; you can ask the game what any
 symbol represents with the \(oq/\(cq command (see the next section for