qapi: Drop unnecessary whitespace in comments

The only instances that get changed are those in which the
additional whitespace was not (or couldn't possibly be) used for
alignment purposes.

Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Message-Id: <20220503073737.84223-7-abologna@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
11 files changed