IncludedData is not documentated correctly anymore

[bakgaard]

Description
The documentation in the Readme is incorrect after an update (most likely from 3.x.x to 4.x.x);
Looking at IncludedData in the section serilog-logevent-to-opentelemetry-log-record-mapping, I the TraceId is now called TraceIdField, SpanId is called SpanIdField, and some of the others suffer the same issue from IncludedData.cs.

I would recommend checking which have been updated, and let the documentation reflect it.

Reproduction

Expected behavior

Relevant package, tooling and runtime versions

Additional context

[nblumhardt]

Thanks for the note! I've fixed the instances of this that I could find; please let me know if you spot any others I've missed :-) Cheers!