reflect proper default for DD_LOGS_INJECTION (DataDog#3077)

DD_LOGS_INJECTION defaults to false here: https://github.com/DataDog/dd-trace-py/blob/master/ddtrace/settings/config.py#L141

update table to reflect it

Co-authored-by: Brett Langdon <brett.langdon@datadoghq.com>

Author: melancholy

docs/configuration.rst

@@ -89,7 +89,7 @@ below:
        .. _dd-logs-injection:
    * - ``DD_LOGS_INJECTION``
      - Boolean
-     - True
+     - False
      - Enables :ref:`Logs Injection`.
 
        .. _dd-call-basic-config: