Update online source to be consistent with onine API

The Stem API descriptions online are not consistent with the linked source. For example, ExitPolicyRule.is_match() shows a strict parameter at https://stem.torproject.org/api/exit_policy.html. However, the "source" link shows a function without the strict parameter (https://stem.torproject.org/_modules/stem/exit_policy.html#ExitPolicyRule.is_match).

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