uniq Info page needs clarification

[Dan Jacobson]

Regarding the uniq info page:

`-d'
`--repeated'
     Print only duplicate lines.

`-D'
`--all-repeated'
     Print all duplicate lines and only duplicate lines.  This option
     is useful mainly in conjunction with other options e.g., to ignore
     case or to compare only selected fields.  This is a GNU extension.

I think you still need to add some examples to make this clearer.

By the way, regarding:
      The input must be sorted.  If your input is not sorted, perhaps you
      want to use `sort -u'.
Please change this to:
      The input must be sorted.  If your input is not sorted, perhaps you
      want to use `sort' first.  Maybe `sort -u' could eliminate your
      need for uniq altogether.
Or something like that.
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