docs/devel/qapi-code-gen: Don't reserve types ending with 'Kind'

We reserved type names ending with 'Kind' because a simple union
'SomeSimpleUnion' generated both a struct type SomeSimpleUnion and an
enum type SomeSimpleUnionKind.  Gone since commit 4e99f4b12c0 (qapi:
Drop simple unions).  The commit neglected to update the documentation
not to reserve type names ending with 'Kind'.  Do that now.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20231221145727.835905-1-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
1 file changed