input: Docs: correct ntrig.rst typo

Fix a typo in ntrig.rst (found with 'codespell').
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: linux-input@vger.kernel.org
Cc: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20220516002047.11395-1-rdunlap@infradead.orgSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/input/devices/ntrig.rst

@@ -32,7 +32,7 @@ The following parameters are used to configure filters to reduce noise:
 |activation_height,	|size threshold to activate immediately		      |
 |activation_width	|						      |
 +-----------------------+-----------------------------------------------------+
-|min_height,		|size threshold bellow which fingers are ignored      |
+|min_height,		|size threshold below which fingers are ignored       |
 |min_width		|both to decide activation and during activity	      |
 +-----------------------+-----------------------------------------------------+
 |deactivate_slack	|the number of "no contact" frames to ignore before   |