Correct wrong and misleading comments about enemy trainer AI

data/battle/ai/rain_dance_moves.asm

@@ -1,4 +1,4 @@
-; AI_SMART prefers these moves during rain.
+; AI_SMART encourages Rain Dance if it also knows these moves.
 
 RainDanceMoves:
 	db WATER_GUN

data/battle/ai/stall_moves.asm

@@ -1,5 +1,5 @@
 ; AI_OPPORTUNIST discourages these moves
-; when the player's HP is low.
+; when its HP is low.
 
 StallMoves:
 	db SWORDS_DANCE

data/battle/ai/sunny_day_moves.asm

@@ -1,7 +1,7 @@
-; AI_SMART prefers these moves during harsh sunlight.
+; AI_SMART encourages Sunny Day if it also knows these moves.
 
 SunnyDayMoves:
-; BUG: "Smart" AI does not encourage Solar Beam, Flame Wheel, or Moonlight during Sunny Day (see docs/bugs_and_glitches.md)
+; BUG: "Smart" AI does not encourage Sunny Day when it knows Solar Beam, Flame Wheel, or Moonlight (see docs/bugs_and_glitches.md)
 	db FIRE_PUNCH
 	db EMBER
 	db FLAMETHROWER

data/battle/ai/useful_moves.asm

@@ -1,4 +1,5 @@
-; AI_SMART knows these moves are usable all-around.
+; AI_SMART tries to use Mirror Move, Mimic, and Disable
+; after the player uses these moves.
 
 UsefulMoves:
 	db DOUBLE_EDGE

engine/battle/ai/scoring.asm

@@ -54,7 +54,7 @@ AI_Basic:
 	and a
 	jr nz, .discourage
 
-; Dismiss Safeguard if it's already active.
+; Dismiss status moves if the player is Safeguarded.
 	ld a, [wPlayerScreens]
 	bit SCREENS_SAFEGUARD, a
 	jr z, .checkmove