Update Jaeger remote tracer port to OTLP port 4317 in OpenTelemetry docs

[Irash-Perera]

Purpose

Related Issues : #4782 | #4775

From APIM 4.7, the jaeger remote tracer no longer uses Jaeger's native protocol. The OpenTelemetry Java SDK bundled with APIM removed its Jaeger-native exporter (Jaeger itself deprecated the native protocol in favor of OTLP and removed it entirely in Jaeger v2), so the jaeger tracer now exports spans over OTLP gRPC.

The documented port 14250 is Jaeger's legacy native endpoint, which does not accept OTLP. With that configuration, the server starts normally but every span export fails with:

Failed to export spans. Server responded with UNIMPLEMENTED.
Full error message: unknown service opentelemetry.proto.collector.trace.v1.TraceService

and no traces ever appear in the Jaeger UI.

Port 4317 is Jaeger's OTLP gRPC endpoint. With this change, the sample configuration works as expected.

This applies to the 4.7/latest documentation only. APIM 4.5 and 4.6 still bundle the Jaeger-native exporter, so port 14250 remains the correct value in those documentation versions.

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