Fix required index version for online reindexing in 2.11 release notes
Fix required index version for online reindexing in 2.11 release notes

Online reindexing with 2.11 requires an index version of 11 and not
10. Index version 10 was deleted by [1].

[1] https://gerrit-review.googlesource.com/62684

Change-Id: I805fec9c9cb87209421f02410a7ce3db1a65969b
Signed-off-by: Edwin Kempin <b444e279ad95fdef4fbdd82c813b624595df204a@sap.com>

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