Fix spelling and capitalization issues in dat and DEVEL.

dat/hh

@@ -96,7 +96,7 @@ M-2     twoweapon toggle two-weapon combat (unless number_pad is enabled)
 M-a     adjust  adjust inventory letters
 M-A     annotate add a one-line note to the current dungeon level (see M-O)
 M-c     chat    talk to someone
-M-C     conduct view optional challanges
+M-C     conduct view optional challenges
 M-d     dip     dip an object into something
 M-e     enhance advance or check weapon and spell skills
 M-f     force   force a lock

dat/opthelp

@@ -104,7 +104,7 @@ preload_tiles  control whether tiles get pre-loaded into RAM at   [TRUE]
                of the tile graphics, but uses more memory.
 
 Boolean option if TTY_TILES_ESCCODES was set at compile time (tty only):
-vt_tiledata    insert extra data escae code markers into output   [FALSE]
+vt_tiledata    insert extra data escape code markers into output  [FALSE]
 
 Any Boolean option can be negated by prefixing it with a '!' or 'no'.
 
@@ -159,7 +159,7 @@ paranoid_confirmation  space separated list    [paranoid_confirmation:pray]
               pray    -- y to confirm an attempt to pray; on by default
               Remove  -- always pick from inventory for 'R' and 'T' even when
               wearing just one applicable item to remove or take off
-pickup_burden when you pick up an item that exceeds this encumberance   [S]
+pickup_burden when you pick up an item that exceeds this encumbrance    [S]
               level (Unencumbered, Burdened, streSsed, straiNed, overTaxed,
               or overLoaded), you will be asked if you want to continue.
 pickup_types  a list of default symbols for kinds of objects to          []

dat/quest.txt

@@ -1668,7 +1668,7 @@ to %ns lair.  If you can manage to defeat %n and return
 undead that befoul the land.
 
 "Go with %d as your guide, %p."
-%E [%nC invaded %H and captured %o.  Defeat %ni and retrive %oh.]
+%E [%nC invaded %H and captured %o.  Defeat %ni and retrieve %oh.]
 %Cp Pri 00025
 "You can prevail, if you rely on %d."
 %E
@@ -2056,7 +2056,7 @@ the Amulet."
 %E [You have succeeded.  Take %o with you as you go to find the Amulet.]
 # assumes The Longbow of Diana
 %Cc Ran 00082
-%l flexs %o reverently.
+%l flexes %o reverently.
 
 "With this wondrous bow, one need never run out of arrows.
 You are its keeper now, and the time has come to resume your
@@ -2967,7 +2967,7 @@ The ice and snow gives way to a valley floor.  You %x ahead of you
 a huge round hill surrounded by pools of lava.  This then is the entrance
 to %i.  It looks like you're not going to get in without
 a fight though.
-%E [This is the entrace to %i.]
+%E [This is the entrance to %i.]
 %Cp Val 00036
 Once again, you stand before the entrance to %i.
 %E