Added missing end points for brief descriptions in the docs.

(cherry picked from commit d912e10c65)

doc/classes/ARVRAnchor.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <class name="ARVRAnchor" inherits="Spatial" category="Core" version="3.0.2">
 	<brief_description>
-		Anchor point in AR Space
+		Anchor point in AR Space.
 	</brief_description>
 	<description>
 		The ARVR Anchor point is a spatial node that maps a real world location identified by the AR platform to a position within the game world. For example, as long as plane detection in ARKit is on, ARKit will identify and update the position of planes (tables, floors, etc) and create anchors for them.

doc/classes/AudioStreamPlayer3D.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <class name="AudioStreamPlayer3D" inherits="Spatial" category="Core" version="3.0.2">
 	<brief_description>
-		Plays 3D sound in 3D space
+		Plays 3D sound in 3D space.
 	</brief_description>
 	<description>
 		Plays a sound effect with directed sound effects, dampens with distance if needed, generates effect of hearable position in space.

doc/classes/CheckBox.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <class name="CheckBox" inherits="Button" category="Core" version="3.0.2">
 	<brief_description>
-		Binary choice user interface widget
+		Binary choice user interface widget.
 	</brief_description>
 	<description>
 		A checkbox allows the user to make a binary choice (choosing only one of two possible options), for example Answer 'yes' or 'no'.

doc/classes/ColorPickerButton.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <class name="ColorPickerButton" inherits="Button" category="Core" version="3.0.2">
 	<brief_description>
-		Button that pops out a [ColorPicker]
+		Button that pops out a [ColorPicker].
 	</brief_description>
 	<description>
 		Encapsulates a [ColorPicker] making it accesible by pressing a button, pressing the button will toggle the [ColorPicker] visibility

doc/classes/ConeTwistJoint.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <class name="ConeTwistJoint" inherits="Joint" category="Core" version="3.0.2">
 	<brief_description>
-		A twist joint between two 3D bodies
+		A twist joint between two 3D bodies.
 	</brief_description>
 	<description>
 		The joint can rotate the bodies across an axis defined by the local x-axes of the [Joint].

doc/classes/GridContainer.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <class name="GridContainer" inherits="Container" category="Core" version="3.0.2">
 	<brief_description>
-		Grid container used to arrange elements in a grid like layout
+		Grid container used to arrange elements in a grid like layout.
 	</brief_description>
 	<description>
 		Grid container will arrange its children in a grid like structure, the grid columns are specified using the [method set_columns] method and the number of rows will be equal to the number of children in the container divided by the number of columns, for example: if the container has 5 children, and 2 columns, there will be 3 rows in the container. Notice that grid layout will preserve the columns and rows for every size of the container.

doc/classes/InterpolatedCamera.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <class name="InterpolatedCamera" inherits="Camera" category="Core" version="3.0.2">
 	<brief_description>
-		Camera which moves toward another node
+		Camera which moves toward another node.
 	</brief_description>
 	<description>
 		InterpolatedCamera is a [Camera] which smoothly moves to match a target node's position and rotation.

doc/classes/LinkButton.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <class name="LinkButton" inherits="BaseButton" category="Core" version="3.0.2">
 	<brief_description>
-		Simple button used to represent a link to some resource
+		Simple button used to represent a link to some resource.
 	</brief_description>
 	<description>
 		This kind of buttons are primarily used when the interaction with the button causes a context change (like linking to a web page).

doc/classes/Position3D.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <class name="Position3D" inherits="Spatial" category="Core" version="3.0.2">
 	<brief_description>
-		Generic 3D Position hint for editing
+		Generic 3D Position hint for editing.
 	</brief_description>
 	<description>
 		Generic 3D Position hint for editing. It's just like a plain [Spatial] but displays as a cross in the 3D-Editor at all times.