Remove unnecessary migration guides (#2104)

Author: JaySpruce

release-content/0.16/migration-guides/16753_rename_enqueue_command__to_queue_command__for_consistency.md

@@ -346,12 +346,6 @@ prs = [17685]
 areas = ["ECS"]
 file_name = "17685_Split_Componentregister_component_hooks_into_individual_me.md"
 
-[[guides]]
-title = "Don't re-export `EntityHashSet` and `EntityHashMap`"
-prs = [17447]
-areas = ["ECS"]
-file_name = "17447_Support_nonVec_data_structures_in_relations.md"
-
 [[guides]]
 title = "Turn `apply_deferred()` into a ZST system"
 prs = [16642]
@@ -388,24 +382,12 @@ prs = [16912]
 areas = ["ECS"]
 file_name = "16912_make_EntityHashMap_and_EntityHashSet_proper_types.md"
 
-[[guides]]
-title = "make various entity wrapper type modules public"
-prs = [18248]
-areas = ["ECS"]
-file_name = "18248_make_various_entity_wrapper_type_modules_public.md"
-
 [[guides]]
 title = "one shot system cleanup"
 prs = [16516]
 areas = ["ECS"]
 file_name = "16516_one_shot_system_cleanup.md"
 
-[[guides]]
-title = "rename enqueue_command  to queue_command  for consistency"
-prs = [16753]
-areas = ["ECS"]
-file_name = "16753_rename_enqueue_command__to_queue_command__for_consistency.md"
-
 [[guides]]
 title = "Make `ComponentTicks` field public"
 prs = [16269]
@@ -1001,20 +983,8 @@ prs = [16716]
 areas = []
 file_name = "16716_Rename_triggerentity_to_triggertarget.md"
 
-[[guides]]
-title = "Use 4-byte LightmapSlabIndex for batching instead of 16-byte `AssetId<Image>`"
-prs = [18326]
-areas = []
-file_name = "18326_Use_4byte_LightmapSlabIndex_for_batching_instead_of_16byte.md"
-
 [[guides]]
 title = "Use `target_abi = \"sim\"` instead of `ios_simulator` feature"
 prs = [17702]
 areas = []
 file_name = "17702_Use_target_abi__sim_instead_of_ios_simulator_feature.md"
-
-[[guides]]
-title = "Closures which panic now need to explicitly specify a `()` return type"
-prs = [17967]
-areas = ["ECS"]
-file_name = "panicking_closures.md"