Some simple typo/spelling fixes.

There are more of these coming - this is just my first batch.

lib/world/wld/169.wld

@@ -309,12 +309,12 @@ D3
 S
 #16917
 A Dark Cave~
-   This room is thick with the dog-like smell of gibberlings, going about thier
-daily routine, making weapons and eating, which are two of thier favorite
+   This room is thick with the dog-like smell of gibberlings, going about their
+daily routine, making weapons and eating, which are two of their favorite
 hobbies.  In this narrow section of the cave, it's a marvel to watch so many of
 these crazed, ill-mannered beasts exist in such a small area.  There is barely
 even room to manuever here, so they simply rush through, trampling anything in
-thier path.
+their path.
 ~
 169 8 0 0 0 0
 D2
@@ -332,7 +332,7 @@ A Wide Tunnel~
 the gibberlings emerging from all directions, across the especially jagged
 surface of the ground, which is pock marked by pits and large stones strewn
 across the area.  The room looks like it's been through at least one cave in,
-or a collapse, perhaps the gibberlings just dug thier way through after being
+or a collapse, perhaps the gibberlings just dug their way through after being
 trapped in the cave by enemies long ago.
 ~
 169 8 0 0 0 0
@@ -370,7 +370,7 @@ bones stones rocks~
    Many small, crushed, and cracked bones and skulls lie here, among the rocks.
 You can only guess that they may have been gibberlings who died in the cave, or
 others, who unwittingly stumbled upon this nest of depraved creatures, only to
-die an agonizing, pitiless death, at the hands of thier barbaric attackers.
+die an agonizing, pitiless death, at the hands of their barbaric attackers.
 ~
 S
 #16920
@@ -490,7 +490,7 @@ S
 The Torture Pit~
    As uncontrollable and savage as the gibberlings may be, they are not
 completely without reason.  Indeed they comprehend the immense pain they
-inflict on thier victims, and they revel in it.  Here you see a large dugout
+inflict on their victims, and they revel in it.  Here you see a large dugout
 section of the cave, the floor drenched in blood and littered with various body
 parts, cold, sharp instruments lining the stone walls, while horrible sounds of
 anguish, escape the lips of dying and dismembered animals and unlucky
@@ -656,7 +656,7 @@ hides skins~
    The stretched and dried skins of warriors and adventurers killed in battle,
 adorn the throne itself, as well as many of the walls in the room.  The heads
 have not been removed, as the gibberlings wish to preserve the indescribable
-horror frozen in the faces of thier many victims, when they die.
+horror frozen in the faces of their many victims, when they die.
 ~
 E
 throne bones giant~
@@ -714,13 +714,13 @@ trees fence vines~
    The living fence surrounding Tanto's yard is a masterpiece, which took much
 time, and careful attention to make.  Stout trees grown seemingly impossibly
 close together, linked by a growing trellis of green and purple vines climbing
-thier length, and the tangled mass of hardy roots , extending their protection
+their length, and the tangled mass of hardy roots , extending their protection
 a few feet into the yard from each direction.
 ~
 E
 stone benches~
    There are two, magnificent stone benches, which appear to have been crafted
-by a very skilled artist, portraying on thier mottled surfaces, a chiseled
+by a very skilled artist, portraying on their mottled surfaces, a chiseled
 rendition of some great battle, between the immortal Tanto, and an endless
 horde of monstrous warriors.  The top of each bench is a single rectangular
 stone slab, supported by four stone legs, shaped like the hind legs of a lion,