Undo changes to environment variable docs

This appears to cause an issue with "tox -e docs".

Author: michaelsafyan

opentelemetry-sdk/src/opentelemetry/sdk/environment_variables/__init__.py

@@ -50,8 +50,7 @@
 """
 .. envvar:: OTEL_LOG_LEVEL
 
-The :envvar:`OTEL_LOG_LEVEL` environment variable sets the log level used by the SDK logger.
-OTLP exporters will log partial success responses when this is set to `debug` or `verbose`.
+The :envvar:`OTEL_LOG_LEVEL` environment variable sets the log level used by the SDK logger
 Default: "info"
 """