Release notes refers to deprecated and undocumented fluentd option

[bluikko]

File: engine/release-notes/index.md

The release notes talk about fluentd-async-connect option and it took me a while to find out what that even refers to. The fluentd driver documentation has only fluentd-async option.

Apparently fluentd-async-connect is a deprecated option and currently fluentd-async should be used instead.
The release notes should not refer to a deprecated and undocumented option?

[docker-robott]

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