doc formatting

Remove trailing spaces from doc/fixes36.1 (only a couple),
doc/Guidebook.mn (several), and doc/Guidebook.tex (many).  I re-split
some lines made wider by embedded formatting directives, but tried to
avoid getting carried away with that.

I think I added one missing period to Guidebook.mn and one missing
comma to Guidebook.tex.  Aside from that, they should format the same
as they did before this patch.

doc/fixes36.1

@@ -80,7 +80,7 @@ change "unlockable chest" to "broken chest" so that it won't be misunderstood
 use doname instead of xname when using '/' or ';' to look at objects on map
 when a pet moves reluctantly, name the top item of the pile it is reluctant
 	to step on if the hero sees or remembers any object(s) at that spot
-ensure sufficient messages are given to clarify the transition from detected 
+ensure sufficient messages are given to clarify the transition from detected
 	vampire bats to fog clouds in Vlad's tower
 fix "killing by kicking something weird" when kicking an object causes death
 avoid accessing mextra fields which haven't been allocated
@@ -519,7 +519,7 @@ change the deity's "congratulations" message upon ascension to something which
 	sounds a bit more archaic to fit better with the other messages
 prayer boon of 'fix all troubles' could get stuck in an infinite loop for
 	TROUBLE_STUCK_IN_WALL if there was no spot to teleport into available
-It shouldn't be considered hypocrisy if you speed up your pet while standing 
+It shouldn't be considered hypocrisy if you speed up your pet while standing
 	on Elbereth
 fix 'object lost' panic if hero with lycanthropy but in human form is wielding
 	a potion of unholy water which gets boiled/exploded by fire, causing
@@ -869,7 +869,7 @@ Ray Chason's fix: window interfaces that support transparency may give away
 Ray Chason's xprname should honor iflags.menu_tab_sep
 Ray Chason's punctuation for "That foo is really a mimic."
 Ray Chason's proper background tiles for lava and water
-Ray Chason's MS-DOS port restored to functionality with credit to Reddit user 
+Ray Chason's MS-DOS port restored to functionality with credit to Reddit user
 	b_helyer for the fix to sys/share/pcmain.c
 Ray Chason's MSDOS port support for some VESA modes
 Ray Chason's Qt4 windowport