Update examples to use PlatformSupport.makeEventLoopGroup?

[Jerry-Carter]

Describe the bug

According to the Using TLS guide, the use of

PlatformSupport.makeEventLoopGroup(loopCount: System.coreCount)

is preferred over calling MultiThreadedEventLoopGroup for TLS. Presumably this is generally true and the Examples should be updated accordingly.

[glbrntt]

Yes, ideally they would make use of PlatformSupport.makeEventLoopGroup