qcacmn: Fix documentation error in unregister API of rate2power handler

Correct the documentation of the function
tgt_if_regulatory_unregister_rate2power_table_update_handler().

Change-Id: I04da3b3bd66f0665023a387d06cbe8c8242b152a
CRs-Fixed: 3430546

target_if/regulatory/src/target_if_reg.c

@@ -1363,7 +1363,7 @@ tgt_if_regulatory_register_rate2power_table_update_handler(
 }
 
 /**
- * tgt_if_regulatory_register_rate2power_table_update_handler() - Unregister
+ * tgt_if_regulatory_unregister_rate2power_table_update_handler() - Unregister
  * rate2power table update handler
  * @psoc: Pointer to psoc
  * @arg: Pointer to argument list