docs/ure: Fix match.group signature to indicate index param is required.
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@ -175,7 +175,7 @@ Match objects
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Match objects as returned by `match()` and `search()` methods, and passed
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to the replacement function in `sub()`.
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.. method:: match.group([index])
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.. method:: match.group(index)
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Return matching (sub)string. *index* is 0 for entire match,
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1 and above for each capturing group. Only numeric groups are supported.
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