Core: Rename GetCreatureInfo to GetCreatureTemplate and minor cleanup here and there

src/server/scripts/Commands/cs_learn.cpp

@@ -248,7 +248,7 @@ public:
             return false;
         }
 
-        CreatureTemplate const* creatureInfo = pet->GetCreatureInfo();
+        CreatureTemplate const* creatureInfo = pet->GetCreatureTemplate();
         if (!creatureInfo)
         {
             handler->SendSysMessage(LANG_WRONG_PET_TYPE);