Update snap to ground documentation to match implementation (#136)

Co-authored-by: kylesower <[email protected]>

Author: kylesower

docs/user_guides/templates/character_controller_snap_to_ground.mdx

@@ -4,7 +4,7 @@ import TabItem from '@theme/TabItem';
 If enabled, **snap-to-ground** will force the character to stick to the ground if the following conditions are met
 simultaneously:
 - At the start of the movement, the character touches the ground.
-- The movement has no up component (i.e. the character isn’t jumping).
+- The movement has a slight downward component.
 - At the end of the desired movement, the character would be separated from the ground by a distance smaller than the
 distance provided by the **snap-to-ground** parameter.
 
@@ -36,4 +36,4 @@ Typical usages of snap-to-ground include going downstairs or remaining in contac
 <load path='/2d/javascript/src/snippets/character_controller.ts' marker='Snap' />
 ```
 
-</js>
+</js>