Proofread and improve the whole class reference

- Document a few more properties and methods
- Add more information to many classes
- Fix lots of typos and gramar mistakes
- Use [code] tags for parameters consistently
- Use [b] and [i] tags consistently
- Put "Warning:" and "Note:" on their own line to be more visible,
  and make them always bold
- Tweak formatting in code examples to be more readable
- Use double quotes consistently
- Add more links to third-party technologies

doc/classes/Physics2DShapeQueryParameters.xml

@@ -15,7 +15,7 @@
 			<argument index="0" name="shape" type="Resource">
 			</argument>
 			<description>
-				Set the [Shape2D] that will be used for collision/intersection queries.
+				Sets the [Shape2D] that will be used for collision/intersection queries.
 			</description>
 		</method>
 	</methods>
@@ -37,7 +37,7 @@
 			The motion of the shape being queried for.
 		</member>
 		<member name="shape_rid" type="RID" setter="set_shape_rid" getter="get_shape_rid">
-			The [RID] of the queried shape. See [method set_shape] also.
+			The [RID] of the queried shape. See also [method set_shape].
 		</member>
 		<member name="transform" type="Transform2D" setter="set_transform" getter="get_transform">
 			the transform matrix of the queried shape.