PNP: fix kernel-doc markups

It sounds that there were function renames. Update the kernel-doc
markups accordingly.

Signed-off-by: Mauro Carvalho Chehab <[e-mail]>
Signed-off-by: Rafael J. Wysocki <[e-mail]>

drivers/pnp/core.c

···
 }
 
 /**
- * pnp_protocol_register - adds a pnp protocol to the pnp layer
+ * pnp_register_protocol - adds a pnp protocol to the pnp layer
  * @protocol: pointer to the corresponding pnp_protocol structure
  *
  *  Ex protocols: ISAPNP, PNPBIOS, etc
···
 }
 
 /**
- * pnp_protocol_unregister - removes a pnp protocol from the pnp layer
+ * pnp_unregister_protocol - removes a pnp protocol from the pnp layer
  * @protocol: pointer to the corresponding pnp_protocol structure
  */
 void pnp_unregister_protocol(struct pnp_protocol *protocol)