docs: networking: nfc: fix bullet list syntax

Fix this warning:

Documentation/networking/nfc.rst:87: WARNING: Bullet list ends without
a blank line; unexpected unindent.
Signed-off-by: NRobert Schwebel <r.schwebel@pengutronix.de>
Signed-off-by: NJakub Kicinski <jakub.kicinski@netronome.com>

Documentation/networking/nfc.txt

@@ -84,7 +84,7 @@ The operations are composed by commands and events, all listed below:
 * NFC_EVENT_DEVICE_ADDED - reports an NFC device addition
 * NFC_EVENT_DEVICE_REMOVED - reports an NFC device removal
 * NFC_EVENT_TARGETS_FOUND - reports START_POLL results when 1 or more targets
-are found
+  are found
 
 The user must call START_POLL to poll for NFC targets, passing the desired NFC
 protocols through NFC_ATTR_PROTOCOLS attribute. The device remains in polling