Update documentation changelog with new pages added since 3.1

This also moves some pages that were said to be added since 3.0,
but were actually added after the 3.1 release.

This orders categories in the order they are mentioned in the index.

about/docs_changelog.rst

@@ -13,25 +13,95 @@ to the class reference. Below is a list of new tutorials added since version 3.0
 New tutorials since version 3.1
 -------------------------------
 
+Project workflow
+^^^^^^^^^^^^^^^^
+
+- :ref:`doc_android_custom_build`
+
+2D
+^^
+
+- :ref:`doc_2d_sprite_animation`
+
+Audio
+^^^^^
+
+- :ref:`doc_sync_with_audio`
+
+Math
+^^^^
+
+- :ref:`doc_beziers_and_curves`
+- :ref:`doc_interpolation`
+
+Inputs
+^^^^^^
+
+- :ref:`doc_input_examples`
+
 Internationalization
 ^^^^^^^^^^^^^^^^^^^^
 
 - :ref:`doc_localization_using_gettext`
 
+Shading
+^^^^^^^
+
+Your First Shader Series:
+  - :ref:`doc_what_are_shaders`
+  - :ref:`doc_your_first_canvasitem_shader`
+  - :ref:`doc_your_first_spatial_shader`
+  - :ref:`doc_your_second_spatial_shader`
+
+Networking
+^^^^^^^^^^
+
+- :ref:`doc_webrtc`
+
+Plugins
+^^^^^^^
+
+- :ref:`doc_android_plugin`
+- :ref:`doc_inspector_plugins`
+
+Multi-threading
+^^^^^^^^^^^^^^^
+
+- :ref:`doc_using_multiple_threads`
+
+Creating content
+^^^^^^^^^^^^^^^^
+
+- :ref:`doc_procedural_geometry`
+
+Optimization
+^^^^^^^^^^^^
+
+- :ref:`doc_using_multimesh`
+- :ref:`doc_using_servers`
+
+Legal
+^^^^^
+
+- :ref:`doc_complying_with_licenses`
+
 New tutorials since version 3.0
 -------------------------------
 
-Step-by-step
+Step by step
 ^^^^^^^^^^^^
 
 - :ref:`doc_signals`
 - :ref:`doc_exporting`
 
+Scripting
+^^^^^^^^^
+
+- :ref:`doc_gdscript_static_typing`
+
 Project workflow
 ^^^^^^^^^^^^^^^^
 
-- :ref:`doc_android_custom_build`
-
 Best Practices:
   - :ref:`doc_introduction_best_practices`
   - :ref:`doc_what_are_godot_classes`
@@ -44,11 +114,6 @@ Best Practices:
   - :ref:`doc_data_preferences`
   - :ref:`doc_logic_preferences`
 
-Scripting
-^^^^^^^^^
-
-- :ref:`doc_gdscript_static_typing`
-
 2D
 ^^
 
@@ -92,12 +157,6 @@ Shading
 - :ref:`doc_migrating_to_godot_shader_language`
 - :ref:`doc_advanced_postprocessing`
 
-Your First Shader Series:
-  - :ref:`doc_what_are_shaders`
-  - :ref:`doc_your_first_canvasitem_shader`
-  - :ref:`doc_your_first_spatial_shader`
-  - :ref:`doc_your_second_spatial_shader`
-
 Shading Reference:
   - :ref:`doc_shaders`
   - :ref:`doc_shading_language`
@@ -110,6 +169,12 @@ VR
 
 - :ref:`doc_vr_starter_tutorial`
 
+Plugins
+^^^^^^^
+
+- :ref:`doc_making_main_screen_plugins`
+- :ref:`doc_spatial_gizmo_plugins`
+
 Platform-specific
 ^^^^^^^^^^^^^^^^^
 
@@ -120,11 +185,10 @@ Multi-threading
 
 - :ref:`doc_thread_safe_apis`
 
-Optimization
-^^^^^^^^^^^^
+Creating content
+^^^^^^^^^^^^^^^^
 
-- :ref:`doc_using_multimesh`
-- :ref:`doc_using_servers`
+- :ref:`doc_making_trees`
 
 Miscellaneous
 ^^^^^^^^^^^^^
@@ -134,11 +198,6 @@ Miscellaneous
 - :ref:`doc_change_scenes_manually`
 - :ref:`doc_gles2_gles3_differences`
 
-Legal
-^^^^^
-
-- :ref:`doc_complying_with_licenses`
-
 Compiling
 ^^^^^^^^^
 
@@ -149,15 +208,3 @@ Engine development
 ^^^^^^^^^^^^^^^^^^
 
 - :ref:`doc_binding_to_external_libraries`
-
-Creating content
-^^^^^^^^^^^^^^^^
-
-- :ref:`doc_making_trees`
-
-Plugins
-^^^^^^^
-
-- :ref:`doc_making_main_screen_plugins`
-- :ref:`doc_spatial_gizmo_plugins`
-- :ref:`doc_android_plugin`