[BUG] Elastic.Serilog.Sinks/README.md is outdated

[milostns]

I was trying out your nuget package (currently latest version 8.6.1) for Serilog with the example provided at: https://www.nuget.org/packages/Elastic.Serilog.Sinks

I wouldn't compile because there is no ConcurrentConsumers property anymore in the BufferOptions class.

So I guess following line should be updated in the docs:

ecs-dotnet/src/Elastic.Serilog.Sinks/README.md

Line 28 in eac06c3

ConcurrentConsumers = 10

Also a small typo how wer are communicating on this line:

ecs-dotnet/src/Elastic.Serilog.Sinks/README.md

Line 43 in eac06c3

| `Transport` | An instance of `Elastic.Transport` that dictates where and how wer are communicating to. Defaults to `http://localhost:9200` |