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The lwIP version of wget supports a different syntax with a URL, in addition to the legacy syntax. Document that. While we're at it, fix a couple of minor issues in the legacy syntax: - hostIPaddr can be a DNS name if CONFIG_CMD_DNS is enabled - path is mandatory Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>