Corrected property name on skill_db.yml header doc (#6626)

db/import-tmpl/skill_db.yml

@@ -115,7 +115,7 @@
 #         Amount              Ammo amount required at specific skill level.
 #     State                   Special state required to cast. (Default: None)
 #     Status:                 Status change required to cast. (Default: nullptr)
-#     SphereCost:             Spirit sphere required to cast. (Default: 0)
+#     SpiritSphereCost:       Spirit sphere required to cast. (Default: 0)
 #       - Level               Skill level.
 #         Amount              Spirit sphere required at specific skill level.
 #     ItemCost:               Item required to cast. (Default: 0)

db/pre-re/skill_db.yml

@@ -115,7 +115,7 @@
 #         Amount              Ammo amount required at specific skill level.
 #     State                   Special state required to cast. (Default: None)
 #     Status:                 Status change required to cast. (Default: nullptr)
-#     SphereCost:             Spirit sphere required to cast. (Default: 0)
+#     SpiritSphereCost:       Spirit sphere required to cast. (Default: 0)
 #       - Level               Skill level.
 #         Amount              Spirit sphere required at specific skill level.
 #     ItemCost:               Item required to cast. (Default: 0)

db/re/skill_db.yml

@@ -115,7 +115,7 @@
 #         Amount              Ammo amount required at specific skill level.
 #     State                   Special state required to cast. (Default: None)
 #     Status:                 Status change required to cast. (Default: nullptr)
-#     SphereCost:             Spirit sphere required to cast. (Default: 0)
+#     SpiritSphereCost:       Spirit sphere required to cast. (Default: 0)
 #       - Level               Skill level.
 #         Amount              Spirit sphere required at specific skill level.
 #     ItemCost:               Item required to cast. (Default: 0)