qapi: Spell JSON null correctly in blockdev-reopen documentation

The doc comment misspells JSON null as NULL.  Fix that.

Cc: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20250527073916.1243024-10-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>

diff --git a/qapi/block-core.json b/qapi/block-core.json
index 7b0548dc2ef2ee2e58139134f3472ce54befa5d5..f8f89ee2d7e0397b411a72dae5d5810e60f35933 100644 (file)
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -4947,7 +4947,7 @@
 #  3) A reference to a different node: the current child is replaced
 #     with the specified one.
 #
-#  4) NULL: the current child (if any) is detached.
+#  4) null: the current child (if any) is detached.
 #
 # Options (1) and (2) are supported in all cases.  Option (3) is
 # supported for @file and @backing, and option (4) for @backing only.