docs/devel/qapi-code-gen: Fix typos in QAPI schema language grammar

Fixes: 3248c1aaf2db (docs: update the documentation upfront about schema configuration)
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20250731054044.4011789-3-armbru@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
1 file changed