qapi: Reject section heading in the middle of a doc comment

docs/devel/qapi-code-gen.txt claims "A heading line must be the first
line of the documentation comment block" since commit
55ec69f8b16 (d

qapi: Reject section heading in the middle of a doc comment

docs/devel/qapi-code-gen.txt claims "A heading line must be the first
line of the documentation comment block" since commit
55ec69f8b16 (docs/devel/qapi-code-gen.txt: Update to new rST backend
conventions). Not true, we have code to make it work anywhere in a
free-form doc comment: commit dcdc07a97cb (qapi: Make section headings
start a new doc comment block).

Make it true, for simplicity's sake.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20240216145841.2099240-10-armbru@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>

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