Using incorrect :functions: syntax (extra space) causes an odd kernel-doc
warning, so fix that.

Documentation/driver-api/device_connection.rst:42: ERROR: Error in "kernel-doc" directive:
Signed-off-by: NRandy Dunlap <rdunlap@infradead.org>
Reviewed-by: NHeikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: NJonathan Corbet <corbet@lwn.net>