net: sctp: Fix spelling in Kconfig help

Change 'handeled' to 'handled' in the Kconfig help for SCTP.

Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>