Fix punctuation and capitalization for the "io7" boot parameter.
Signed-off-by: NRandy Dunlap <rdunlap@infradead.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Link: https://lore.kernel.org/r/20200918054751.6538-1-rdunlap@infradead.orgSigned-off-by: NJonathan Corbet <corbet@lwn.net>