doc/netlink: Add bitfield32, s8, s16 to the netlink-raw schema

The netlink-raw schema was not updated when bitfield32 was added
to the genetlink-legacy schema. It is needed for rtnetlink families.

s8 and s16 were also missing.
Signed-off-by: Donald Hunter <donald.hunter@gmail.com>
Link: https://lore.kernel.org/r/20231130214959.27377-2-donald.hunter@gmail.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Documentation/netlink/netlink-raw.yaml

@@ -200,7 +200,8 @@ properties:
                 type: string
               type: &attr-type
                 description: The netlink attribute type
-                enum: [ unused, pad, flag, binary, u8, u16, u32, u64, s32, s64,
+                enum: [ unused, pad, flag, binary, bitfield32,
+                        u8, u16, u32, u64, s8, s16, s32, s64,
                         string, nest, array-nest, nest-type-value ]
               doc:
                 description: Documentation of the attribute.