Documentation: update firmware loader fallback reference

The firmware loader has a fallback mechanism, and it now has some proper
kdoc, but we forgot to update the Documentation to use the new kdoc. Fix
that.

Signed-off-by: Luis R. Rodriguez <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

Documentation/driver-api/firmware/fallback-mechanisms.rst

···
 
 The firmware device used to help load firmware using sysfs is only created if
 direct firmware loading fails and if the fallback mechanism is enabled for your
-firmware request, this is set up with fw_load_from_user_helper().  It is
+firmware request, this is set up with :c:func:`firmware_fallback_sysfs`. It is
 important to re-iterate that no device is created if a direct filesystem lookup
 succeeded.
 
···
 firmware_data_read() and firmware_loading_show() are just provided for the
 test_firmware driver for testing, they are not called in normal use or
 expected to be used regularly by userspace.
+
+firmware_fallback_sysfs
+-----------------------
+.. kernel-doc:: drivers/base/firmware_loader/fallback.c
+   :functions: firmware_fallback_sysfs
 
 Firmware kobject uevent fallback mechanism
 ==========================================