some improvements from alf schlichting:

- correct syntax for retrieving an http page. this example further
corrected by ian darwin (thanks!)
- the -v flag is relatively useless when port scanning, so remove it
from the example, and reword the description appropriately
- udp port scans always report ports as open (i.e. are useless) so
remove example claiming it works, and add CAVEATS to note that -uz is
relatively useless

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