Sync classref with current source

Changes order of brief/long descriptions and removes category
as per godotengine/godot#35132.

classes/class_ninepatchrect.rst

@@ -11,13 +11,13 @@ NinePatchRect
 
 **Inherits:** :ref:`Control<class_Control>` **<** :ref:`CanvasItem<class_CanvasItem>` **<** :ref:`Node<class_Node>` **<** :ref:`Object<class_Object>`
 
-**Category:** Core
-
-Brief Description
------------------
-
 Scalable texture-based frame that tiles the texture's centers and sides, but keeps the corners' original size. Perfect for panels and dialog boxes.
 
+Description
+-----------
+
+Also known as 9-slice panels, NinePatchRect produces clean panels of any size, based on a small texture. To do so, it splits the texture in a 3×3 grid. When you scale the node, it tiles the texture's sides horizontally or vertically, the center on both axes but it doesn't scale or tile the corners.
+
 Properties
 ----------
 
@@ -59,7 +59,7 @@ Signals
 
 - **texture_changed** **(** **)**
 
-Fired when the node's texture changes.
+Emitted when the node's texture changes.
 
 Enumerations
 ------------
@@ -80,11 +80,6 @@ enum **AxisStretchMode**:
 
 - **AXIS_STRETCH_MODE_TILE_FIT** = **2** --- Doesn't do anything at the time of writing.
 
-Description
------------
-
-Also known as 9-slice panels, NinePatchRect produces clean panels of any size, based on a small texture. To do so, it splits the texture in a 3×3 grid. When you scale the node, it tiles the texture's sides horizontally or vertically, the center on both axes but it doesn't scale or tile the corners.
-
 Property Descriptions
 ---------------------
 
@@ -235,9 +230,13 @@ Method Descriptions
 
 - :ref:`int<class_int>` **get_patch_margin** **(** :ref:`Margin<enum_@GlobalScope_Margin>` margin **)** const
 
+Returns the size of the margin identified by the given :ref:`Margin<enum_@GlobalScope_Margin>` constant.
+
 ----
 
 .. _class_NinePatchRect_method_set_patch_margin:
 
 - void **set_patch_margin** **(** :ref:`Margin<enum_@GlobalScope_Margin>` margin, :ref:`int<class_int>` value **)**
 
+Sets the size of the margin identified by the given :ref:`Margin<enum_@GlobalScope_Margin>` constant to ``value`` in pixels.
+