Add link to Pulsar workaround when using environment variables for authentication #39630
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There is a section in the Pulsar client authentication reference guide that warns users of the lack of relaxed binding for authentication parameter map keys.
This lack of relaxed binding prevents users from setting these auth parameters directly via env var as the casing is lost in translation.
The commit adds a link in this area of the reference guide to a workaround in the Spring Pulsar framework reference guide.
User reported issue: spring-projects/spring-pulsar#575
Sample
Notice the newly added sentences in the "Note" section of https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#messaging.pulsar.connecting.auth
This newly added link goes to this newly added page in the Spring Pulsar reference guide: