doc: Sync classref with current source

doc/classes/@GDScript.xml

@@ -20,7 +20,7 @@
 			</argument>
 			<argument index="2" name="b8" type="int">
 			</argument>
-			<argument index="3" name="a8" type="int">
+			<argument index="3" name="a8" type="int" default="255">
 			</argument>
 			<description>
 				Returns a 32 bit color with red, green, blue and alpha channels. Each channel has 8 bits of information ranging from 0 to 255.
@@ -38,7 +38,7 @@
 			</return>
 			<argument index="0" name="name" type="String">
 			</argument>
-			<argument index="1" name="alpha" type="float">
+			<argument index="1" name="alpha" type="float" default="1.0">
 			</argument>
 			<description>
 				Returns a color according to the standardised [code]name[/code] with [code]alpha[/code] ranging from 0 to 1.
@@ -1131,9 +1131,9 @@
 		<method name="yield">
 			<return type="GDScriptFunctionState">
 			</return>
-			<argument index="0" name="object" type="Object">
+			<argument index="0" name="object" type="Object" default="null">
 			</argument>
-			<argument index="1" name="signal" type="String">
+			<argument index="1" name="signal" type="String" default="&quot;&quot;">
 			</argument>
 			<description>
 				Stops the function execution and returns the current state. Call [method GDScriptFunctionState.resume] on the state to resume execution. This invalidates the state.

doc/classes/ArrayMesh.xml

@@ -66,6 +66,16 @@
 				Return the amount of surfaces that the [code]ArrayMesh[/code] holds.
 			</description>
 		</method>
+		<method name="lightmap_unwrap">
+			<return type="int" enum="Error">
+			</return>
+			<argument index="0" name="arg0" type="Transform">
+			</argument>
+			<argument index="1" name="arg1" type="float">
+			</argument>
+			<description>
+			</description>
+		</method>
 		<method name="regen_normalmaps">
 			<return type="void">
 			</return>

doc/classes/AudioStream.xml

@@ -12,6 +12,12 @@
 	<demos>
 	</demos>
 	<methods>
+		<method name="get_length" qualifiers="const">
+			<return type="float">
+			</return>
+			<description>
+			</description>
+		</method>
 	</methods>
 	<constants>
 	</constants>

doc/classes/OS.xml

@@ -36,6 +36,12 @@
 				Returns [code]true[/code] if the current host platform is using multiple threads.
 			</description>
 		</method>
+		<method name="center_window">
+			<return type="void">
+			</return>
+			<description>
+			</description>
+		</method>
 		<method name="delay_msec" qualifiers="const">
 			<return type="void">
 			</return>
@@ -232,6 +238,12 @@
 				Returns the number of cores available in the host machine.
 			</description>
 		</method>
+		<method name="get_real_window_size" qualifiers="const">
+			<return type="Vector2">
+			</return>
+			<description>
+			</description>
+		</method>
 		<method name="get_scancode_string" qualifiers="const">
 			<return type="String">
 			</return>

doc/classes/StreamPeerTCP.xml

@@ -29,16 +29,6 @@
 				Disconnect from host.
 			</description>
 		</method>
-		<method name="set_no_delay">
-			<return type="void">
-			</return>
-			<argument index="0" name="enabled" type="bool">
-			</argument>
-			<description>
-				Disable Nagle algorithm to improve latency for small packets.
-				Note that for applications that send large packets, or need to transfer a lot of data, this can reduce total bandwidth.
-			</description>
-		</method>
 		<method name="get_connected_host" qualifiers="const">
 			<return type="String">
 			</return>
@@ -66,6 +56,16 @@
 			<description>
 			</description>
 		</method>
+		<method name="set_no_delay">
+			<return type="void">
+			</return>
+			<argument index="0" name="enabled" type="bool">
+			</argument>
+			<description>
+				Disable Nagle algorithm to improve latency for small packets.
+				Note that for applications that send large packets, or need to transfer a lot of data, this can reduce total bandwidth.
+			</description>
+		</method>
 	</methods>
 	<constants>
 		<constant name="STATUS_NONE" value="0" enum="Status">