Remove internal language-specific requirements from the batch span processor description. (open-telemetry#417)

* Remove internal language-specific requirements from the batch span processor description.
Also, clean up the language slightly.

* Add the "unmodified" clarification

* add a clarification about the format of the data being pushed to an exporter.

Author: jkwatson

specification/sdk-tracing.md

@@ -233,28 +233,25 @@ Export all ended spans to the configured `Exporter` that have not yet been expor
 
 #### Built-in span processors
 
-SDK MUST implement simple and batch processors described below. Other common
-processing scenarios should be first considered for implementation out-of-process
-in [OpenTelemetry Collector](overview.md#collector)
+The standard OpenTelemetry SDK MUST implement both simple and batch processors,
+as described below. Other common processing scenarios should be first considered
+for implementation out-of-process in [OpenTelemetry Collector](overview.md#collector)
 
 ##### Simple processor
 
-The implementation of `SpanProcessor` that passes ended span directly to the
-configured `SpanExporter`.
+This is an implementation of `SpanProcessor` which passes finished spans
+and passes the export-friendly span data representation to the configured
+`SpanExporter`, as soon as they are finished.
 
 **Configurable parameters:**
 
 * `exporter` - the exporter where the spans are pushed.
 
 ##### Batching processor
 
-The implementation of the `SpanProcessor` that batches ended spans and pushes
-them to the configured `SpanExporter`.
-
-First the spans are added to a synchronized queue, then exported to the exporter
-pipeline in batches. The implementation is responsible for managing the span
-queue and sending batches of spans to the exporters. This processor can cause
-high contention in a very high traffic service.
+This is an implementation of the `SpanProcessor` which create batches of finished
+spans and passes the export-friendly span data representations to the
+configured `SpanExporter`.
 
 **Configurable parameters:**