Removes final remnants of 'targetted' (#79626)

## About The Pull Request

Finishing what https://github.com/tgstation/tgstation/pull/79513/
started, removes 'targetted' typo from code. Also updates the basic mob
guide with the new updated var names.

## Why It's Good For The Game

Typos bad. Accurate guides good.

## Changelog

🆑
code: gets rid of the rest of the instances of 'targetted' typo from
code
/🆑

code/datums/ai/basic_mobs/basic_subtrees/targeted_mob_ability.dm

@@ -1,7 +1,7 @@
 /// Attempts to use a mob ability on a target
 /datum/ai_planning_subtree/targeted_mob_ability
 	/// Blackboard key for the ability
-	var/ability_key = BB_TARGETTED_ACTION
+	var/ability_key = BB_TARGETED_ACTION
 	/// Blackboard key for where the target ref is stored
 	var/target_key = BB_BASIC_MOB_CURRENT_TARGET
 	/// Behaviour to perform using ability

code/datums/ai/basic_mobs/basic_subtrees/use_mob_ability.dm

@@ -1,6 +1,6 @@
 /**
  * Simple behaviours which simply try to use an ability whenever it is available.
- * For something which wants a target try `targetted_mob_ability`.
+ * For something which wants a target try `targeted_mob_ability`.
  */
 /datum/ai_planning_subtree/use_mob_ability
 	/// Blackboard key for the ability