Fix CharacterBody's wall_min_slide_angle doc

Replaced slope by wall

doc/classes/CharacterBody2D.xml

@@ -196,7 +196,7 @@
 			Current velocity vector in pixels per second, used and modified during calls to [method move_and_slide].
 		</member>
 		<member name="wall_min_slide_angle" type="float" setter="set_wall_min_slide_angle" getter="get_wall_min_slide_angle" default="0.261799">
-			Minimum angle (in radians) where the body is allowed to slide when it encounters a slope. The default value equals 15 degrees. This property only affects movement when [member motion_mode] is [constant MOTION_MODE_FLOATING].
+			Minimum angle (in radians) where the body is allowed to slide when it encounters a wall. The default value equals 15 degrees. This property only affects movement when [member motion_mode] is [constant MOTION_MODE_FLOATING].
 		</member>
 	</members>
 	<constants>

doc/classes/CharacterBody3D.xml

@@ -187,7 +187,7 @@
 			Current velocity vector (typically meters per second), used and modified during calls to [method move_and_slide].
 		</member>
 		<member name="wall_min_slide_angle" type="float" setter="set_wall_min_slide_angle" getter="get_wall_min_slide_angle" default="0.261799">
-			Minimum angle (in radians) where the body is allowed to slide when it encounters a slope. The default value equals 15 degrees. When [member motion_mode] is [constant MOTION_MODE_GROUNDED], it only affects movement if [member floor_block_on_wall] is [code]true[/code].
+			Minimum angle (in radians) where the body is allowed to slide when it encounters a wall. The default value equals 15 degrees. When [member motion_mode] is [constant MOTION_MODE_GROUNDED], it only affects movement if [member floor_block_on_wall] is [code]true[/code].
 		</member>
 	</members>
 	<constants>