Document more sprite oversights

[FrenchOrange]

This is a suggestion for docs/bugs_and_glitches.md:

• The Beauty's overworld spriteset, gfx/sprites/beauty.png, lacks one arm pixel in her static back.

• The Link Receptionist's overworld spriteset, gfx/sprites/link_receptionist.png, has a messed-up static back sprite.

• maps/IlexForest.asm: TrainerBugCatcherWayne should use SPRITE_BUG_CATCHER and PAL_NPC_BROWN, not SPRITE_YOUNGSTER and PAL_NPC_GREEN