update interceptors documentation [SPR-11175]

[spring-projects-issues]

Brian Clozel opened SPR-11175 and commented

Mention #new-in-3.2-webmvc-mapped-interceptor-exclude-patterns in #mvc-handlermapping-interce

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Affects: 4.0 RC2

This issue is a sub-task of #15775

Referenced from: commits 84ba9f4