Fix various misused code tag in classref

(cherry picked from commit 85c136bd0718d03961b030333d4a4a042486f51e)

doc/classes/Camera.xml

@@ -203,10 +203,10 @@
 			Disables [url=https://en.wikipedia.org/wiki/Doppler_effect]Doppler effect[/url] simulation (default).
 		</constant>
 		<constant name="DOPPLER_TRACKING_IDLE_STEP" value="1" enum="DopplerTracking">
-			Simulate [url=https://en.wikipedia.org/wiki/Doppler_effect]Doppler effect[/url] by tracking positions of objects that are changed in [code]_process[/code]. Changes in the relative velocity of this camera compared to those objects affect how Audio is perceived (changing the Audio's [code]pitch shift[/code]).
+			Simulate [url=https://en.wikipedia.org/wiki/Doppler_effect]Doppler effect[/url] by tracking positions of objects that are changed in [code]_process[/code]. Changes in the relative velocity of this camera compared to those objects affect how audio is perceived (changing the audio's [member AudioStreamPlayer3D.pitch_scale]).
 		</constant>
 		<constant name="DOPPLER_TRACKING_PHYSICS_STEP" value="2" enum="DopplerTracking">
-			Simulate [url=https://en.wikipedia.org/wiki/Doppler_effect]Doppler effect[/url] by tracking positions of objects that are changed in [code]_physics_process[/code]. Changes in the relative velocity of this camera compared to those objects affect how Audio is perceived (changing the Audio's [code]pitch shift[/code]).
+			Simulate [url=https://en.wikipedia.org/wiki/Doppler_effect]Doppler effect[/url] by tracking positions of objects that are changed in [code]_physics_process[/code]. Changes in the relative velocity of this camera compared to those objects affect how audio is perceived (changing the audio's [member AudioStreamPlayer3D.pitch_scale]).
 		</constant>
 	</constants>
 </class>

doc/classes/Line2D.xml

@@ -83,7 +83,7 @@
 			The smoothness of the rounded joints and caps. This is only used if a cap or joint is set as round.
 		</member>
 		<member name="sharp_limit" type="float" setter="set_sharp_limit" getter="get_sharp_limit" default="2.0">
-			The direction difference in radians between vector points. This value is only used if [code]joint mode[/code] is set to [constant LINE_JOINT_SHARP].
+			The direction difference in radians between vector points. This value is only used if [member joint_mode] is set to [constant LINE_JOINT_SHARP].
 		</member>
 		<member name="texture" type="Texture" setter="set_texture" getter="get_texture">
 			The texture used for the line's texture. Uses [code]texture_mode[/code] for drawing style.

doc/classes/Node.xml

@@ -228,7 +228,7 @@
 			<return type="Node" />
 			<argument index="0" name="path" type="NodePath" />
 			<description>
-				Fetches a node. The [NodePath] can be either a relative path (from the current node) or an absolute path (in the scene tree) to a node. If the path does not exist, a [code]null instance[/code] is returned and an error is logged. Attempts to access methods on the return value will result in an "Attempt to call &lt;method&gt; on a null instance." error.
+				Fetches a node. The [NodePath] can be either a relative path (from the current node) or an absolute path (in the scene tree) to a node. If the path does not exist, [code]null[/code] is returned and an error is logged. Attempts to access methods on the return value will result in an "Attempt to call &lt;method&gt; on a null instance." error.
 				[b]Note:[/b] Fetching absolute paths only works when the node is inside the scene tree (see [method is_inside_tree]).
 				[b]Example:[/b] Assume your current node is Character and the following tree:
 				[codeblock]
@@ -274,7 +274,7 @@
 		<method name="get_parent" qualifiers="const">
 			<return type="Node" />
 			<description>
-				Returns the parent node of the current node, or a [code]null instance[/code] if the node lacks a parent.
+				Returns the parent node of the current node, or [code]null[/code] if the node lacks a parent.
 			</description>
 		</method>
 		<method name="get_path" qualifiers="const">

doc/classes/PhysicsServer.xml

@@ -1131,16 +1131,16 @@
 			Maximum acceleration for the motor at the axes.
 		</constant>
 		<constant name="G6DOF_JOINT_FLAG_ENABLE_LINEAR_LIMIT" value="0" enum="G6DOFJointAxisFlag">
-			If [code]set[/code] there is linear motion possible within the given limits.
+			If set, linear motion is possible within the given limits.
 		</constant>
 		<constant name="G6DOF_JOINT_FLAG_ENABLE_ANGULAR_LIMIT" value="1" enum="G6DOFJointAxisFlag">
-			If [code]set[/code] there is rotational motion possible.
+			If set, rotational motion is possible.
 		</constant>
 		<constant name="G6DOF_JOINT_FLAG_ENABLE_MOTOR" value="4" enum="G6DOFJointAxisFlag">
-			If [code]set[/code] there is a rotational motor across these axes.
+			If set, there is a rotational motor across these axes.
 		</constant>
 		<constant name="G6DOF_JOINT_FLAG_ENABLE_LINEAR_MOTOR" value="5" enum="G6DOFJointAxisFlag">
-			If [code]set[/code] there is a linear motor on this axis that targets a specific velocity.
+			If set, there is a linear motor on this axis that targets a specific velocity.
 		</constant>
 		<constant name="SHAPE_PLANE" value="0" enum="ShapeType">
 			The [Shape] is a [PlaneShape].