Added some documentation for Slider

doc/classes/Slider.xml

@@ -14,14 +14,18 @@
 	</methods>
 	<members>
 		<member name="editable" type="bool" setter="set_editable" getter="is_editable">
+		If [code]true[/code], the slider can be interacted with. If [code]false[/code], the value can be changed only by code.
 		</member>
 		<member name="focus_mode" type="int" setter="set_focus_mode" getter="get_focus_mode" enum="Control.FocusMode">
 		</member>
 		<member name="scrollable" type="bool" setter="set_scrollable" getter="is_scrollable">
+		If [code]true[/code], the value can be changed using the mouse wheel.
 		</member>
 		<member name="tick_count" type="int" setter="set_ticks" getter="get_ticks">
+		Number of ticks displayed on the slider, including border ticks. Ticks are uniformly-distributed value markers.
 		</member>
 		<member name="ticks_on_borders" type="bool" setter="set_ticks_on_borders" getter="get_ticks_on_borders">
+		If [code]true[/code], the slider will display ticks for minimum and maximum values.
 		</member>
 	</members>
 	<constants>

doc/classes/VSlider.xml

@@ -4,7 +4,7 @@
 		Vertical slider.
 	</brief_description>
 	<description>
-		Vertical slider. See [Slider]. This one goes from left (min) to right (max).
+		Vertical slider. See [Slider]. This one goes from bottom (min) to top (max).
 	</description>
 	<tutorials>
 	</tutorials>