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Clarify attributes also use regex (open-telemetry#31496)
Disclaimer: I didn't actually manage find the place in the code where this happens, so please pump the brakes if this is off-base/wrong. The description of `match_type` for `regexp` does not mention attributes, but the [example config in the tests](https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/processor/attributesprocessor/testdata/config.yaml#L303) looks like it uses regexp. This could lead a user to think that regex cannot be used for attribute values when reading the docs here. The docs around the attribute value also indicated "exact", which could lead a user to believe that regex wasn't supported.
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