nginx: clarify with-spdy option.
nginx: clarify with-spdy option.

Make it more obvious that `--with-spdy` will enable the HTTP/2 module
where appropriate.

Closes #47353.

Signed-off-by: Mike McQuaid <a17fed27eaa842282862ff7c1b9c8395a26ac320@mikemcquaid.com>

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