docs: add command-changes concept

docs/src/product-direction/concepts/fancynpcs/command-changes.md

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+# Command Changes
+
+Some commands need to be refactored to be more consistent with the new system.
+
+## turn_to_player and turn_to_player_distance
+
+These commands should be merged into a single command with two subcommands.
+
+- `/npc turn_to_player <npc> enabled (state)`
+- `/npc turn_to_player <npc> distance (distance)`
+
+