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>