npm / cli / #1719

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Fix manNumberRegex in help.js

The current regex will match any .[0-9]. pattern anywhere in the path, which will give incorrect results if npm is installed to a path like .../node-v14.5.5/...

This change restricts it to only the last path element.

PR-URL: https://github.com/npm/cli/pull/2949
Credit: @dmchurch
Close: #2949
Reviewed-by: @wraithgar

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