#1468 Update MigrationGuide.md

* Update MigrationGuide.md

* Update MigrationGuide.md

* Update MigrationGuide.md

* Add more changes to the migration guide

docs/MigrationGuide.md

@@ -26,10 +26,12 @@ Additionally the following things have changed:
 - `ecs_query_desc_t::group_by` has been renamed to `ecs_query_desc_t::group_by_callback`
 - `ecs_query_desc_t::order_by_component` has been renamed to `ecs_query_desc_t::order_by`
 - `ecs_query_desc_t::order_by` has been renamed to `ecs_query_desc_t::order_by_callback`
+- `ecs_query_desc_t::filter` no longer exists, its fields (where applicable) have been moved to `ecs_query_desc_t`.
 - The `ecs_query_next_table` and `ecs_query_populate` functions have been removed.
 - The `ecs_query_table_count` and `ecs_query_empty_table_count` functions have been replaced with `ecs_query_count`, which now returns a struct.
 - The `ecs_query_t` struct is now public, which means that many of the old accessor functions (like `ecs_query_get_ctx`, `ecs_query_get_binding_ctx`) are no longer necessary.
 - The subquery feature has been removed.
+- `ecs_query_fini()` won't be called automatically for uncached queries on world finalization.
 
 A before/after example:
 
@@ -138,7 +140,7 @@ ecs_query_t *q = ecs_query(world, {
 
 // Create cached query with cache kind
 ecs_query_t *q = ecs_query(world, {
-    .filter.terms = {
+    .terms = {
         { .id = ecs_id(Position) },
         { .id = ecs_id(Velocity) },
     },
@@ -357,6 +359,7 @@ The following changes were made to the `new` family of functions in the C API:
 
 - `ecs_new(world, T)` got renamed to `ecs_new_w`
 - `ecs_new_id` got renamed to `ecs_new`
+- `ecs_new_entity` no longer exists, use `ecs_entity(world, { .name = "EntityName" })` instead.
 
 In v3, `ecs_new` took into account values set by `ecs_set_scope` and `ecs_set_with`. In v4 this is no longer the case, and the `ecs_new_w` function will only return the entity with the specified component. To get the old behavior that takes into account scope and with, use `ecs_entity_init`.
 
@@ -519,3 +522,14 @@ The following addons have been removed/merged with other addons:
 - The `ecs_term_copy`/`ecs_term_move`/`ecs_term_fini` functions have been removed. Terms no longer exist by themselves, and term resources are now owned by the query object.
 - The `ecs_iter_poly` function has been removed. To iterate all entities in the world, now use `ecs_get_entities`.
 - `ecs_field_column` has been renamed to `ecs_field_column_index`.
+- `FLECS_TERM_DESC_MAX` has been renamed to `FLECS_TERM_COUNT_MAX`.
+- `ecs_app_desc_t::enable_monitor` has been renamed to `ecs_app_desc_t::enable_stats`.
+- `EcsMetaType` and `EcsMetaTypeSerialized` have been renamed to `EcsType` and `EcsTypeSerializer`, respectively.
+- `ecs_iter_t::terms` got removed and is now accessible through `ecs_iter_t::query::terms`.
+- `ecs_entity_desc_t::add` and `ecs_entity_desc_t::set` are no longer arrays but pointers to zero-terminated arrays.
+- `ecs_default_ctor` has been renamed to `flecs_default_ctor`.
+- `ecs_ensure` has been renamed to `ecs_make_alive`.
+- `binding_ctx` has been renamed in various structs to `callback_ctx`.
+- `ecs_pair_object` has been renamed to `ecs_pair_target`.
+- `ecs_get_context` and `ecs_set_context` have been renamed to `ecs_get_ctx` and `ecs_set_ctx`, respectively; and an `ecs_ctx_free_t` parameter has been added to `ecs_set_ctx`.
+- `ecs_get_stage_id` has been renamed to `ecs_stage_get_id`.