[doc] Fix typo in bookkeeper config `tslProvider` (#2751)
[doc] Fix typo in bookkeeper config `tslProvider` (#2751)

It looks like an obvious typo that `tslProvider` should be `tlsProvider`, and the configuration item in the source code is also `tlsProvider`: https://github.com/apache/bookkeeper/blob/31e8d1b44ffafd867d0eb2774085e4b1141a7acb/bookkeeper-server/src/main/java/org/apache/bookkeeper/conf/AbstractConfiguration.java#L102
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