dc4cda1b13
As of gh-24952, `PathPatternParser` will strictly reject patterns with `"**"` in the middle of them. `"**"` is only allowed at the end of the pattern for matching multiple path segments until the end of the path. Currently, if `"**"` is used in the middle of a pattern it will be considered as a single `"*"` instead. Rejecting such cases should clarify the situation. This commit prepares for that upcoming change and: * logs a warning message if such a case is used by an application * expands the MVC and WebFlux documentation about URI matching in general Closes gh-24958
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