more Guidebook tweaks

Add a missing word to Guidebook.tex and add a couple of new sentences
to both Guidebook.{mn,tex}.

Also, add Guidebook.dat to .gitignore.

doc/Guidebook.tex

@@ -350,7 +350,7 @@ Here are explanations of what the various status items mean:
 %.lp
 \blist{}
 \item[\bb{Title}]
-Your character's name and professional ranking (based on role
+Your character's name and professional ranking (based on role and
 {\it experience level\/}, see below).
 %.lp
 \item[\bb{Strength}]
@@ -2741,7 +2741,7 @@ You can wear at most two rings at any time, one on the ring finger of
 each hand.
 
 %.pg
-Most rings also cause you to grow hungry more rapidly, the rate
+Most worn rings also cause you to grow hungry more rapidly, the rate
 varying with the type of ring.
 
 %.pg
@@ -2829,6 +2829,15 @@ Other tools (such as pick-axe) can be wielded as weapons in addition to
 being applied for their usual purpose, and in some cases (again, pick-axe)
 become wielded as a weapon even when applied.
 
+%.pg
+% Mentioned here because of the old method of attempting "Zen" conduct:
+% restart until there's a blindfold in starting inventory and put it on
+% first thing.
+The {\it blind\/}
+option can be set (prior to game start) to attempt to play the entire
+game without being able to see (a self-imposed challenge which is
+very difficult to accomplish).
+
 %.pg
 The command to use a tool is `{\tt a}' (apply).
 
@@ -2862,6 +2871,8 @@ some harmful, which are activated by putting them on.
 
 %.pg
 Only one amulet may be worn at a time, around your neck.
+Like wearing rings, wearing an amulet affects your metabolism, causing
+you to grow hungry more rapidly.
 
 %.pg
 The commands to use amulets are the same as for rings, `{\tt P}' (put on)