doc: Fix indefinite article an -> a before nouns that begin with 'h'
Although the rule also allows 'an' for historical reasons, 'a' is more common because 'h' is pronounced. Reviewed-by: NPeter Maydell <peter.maydell@linaro.org> Signed-off-by: NStefan Weil <sw@weilnetz.de> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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