Improved readme

Signed-off-by: Juraci Paixão Kröhling <juraci@kroehling.de>

extension/jaegerremotesampling/README.md

@@ -10,21 +10,26 @@ Note that the port `14250` will clash with the Jaeger Receiver. When both are us
 
 Although this extension is derived from Jaeger, it can be used by any clients who can consume this standard, such as the [OpenTelemetry Java SDK](https://github.com/open-telemetry/opentelemetry-java/tree/v1.9.1/sdk-extensions/jaeger-remote-sampler).
 
+At this moment, the `reload_interval` option is only effective for the `file` source. In the future, this property will be used to control a local cache for a `remote` source.
+
+The `file` source can be used to load files from the local file system or from remote HTTP/S sources. The `remote` source must be used with a gRPC server that provides a Jaeger remote sampling service.
+
 ## Configuration
 
 ```yaml
 extensions:
   jaegerremotesampling:
-    grpc:
-      endpoint: :15251
     source:
       remote:
         endpoint: jaeger-collector:14250
   jaegerremotesampling/1:
-    http:
-      endpoint: :5878
     source:
-      file: /etc/otel/sampling_strategies.json
+      reload_interval: 1s
+      file: /etc/otelcol/sampling_strategies.json
+  jaegerremotesampling/2:
+    source:
+      reload_interval: 1s
+      file: http://jaeger.example.com/sampling_strategies.json
 ```
 
 A sampling strategy file could look like: