RFR: Make webrev reject positional arguments

[Leo Korinth via github.com]

Update the man page to reflect accumulated changes to webrev arguments.

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Commits:
 - c6c56c35:	Make webrev reject positional arguments
			Update the man page to reflect accumulated changes to webrev arguments.

Pull request:
https://git.openjdk.java.net/skara/pull/79

Webrev:
https://webrevs.openjdk.java.net/skara/79/webrev.00

Patch:
https://git.openjdk.java.net/skara/pull/79.diff

Fetch command:
git fetch https://git.openjdk.java.net/skara pull/79/head:pull/79