docs/conf.py: add function attribute '__fix_address' to conf.py

Stephen Rothwell reported htmldocs warning when merging net-next:

Documentation/networking/kapi:26: net/core/skbuff.c:780: WARNING: Error in declarator or parameters
Invalid C declaration: Expecting "(" in parameters. [error at 19]
  void __fix_address kfree_skb_reason (struct sk_buff *skb, enum skb_drop_reason reason)
  -------------------^

Add __fix_address keyword to c_id_attributes array in conf.py to fix
the warning.

Link: https://lore.kernel.org/linux-next/[email protected]/
Reported-by: Stephen Rothwell <[email protected]>
Signed-off-by: Menglong Dong <[email protected]>
Tested-by: Bagas Sanjaya <[email protected]>
Signed-off-by: Jonathan Corbet <[email protected]>

Documentation/conf.py

@@ -86,6 +86,7 @@
             "__used",
             "__weak",
             "noinline",
+            "__fix_address",
 
             # include/linux/memblock.h:
             "__init_memblock",