remove dd_trace_enabled and add a link to the corp docs for common co…

…nfigs

docs/configuration.rst

@@ -10,6 +10,14 @@ see specific integration documentation for more details.
 
 The following environment variables for the tracer are supported:
 
+Common Configurations
+-----------------------------
+
+.. ddtrace-configuration-options::
+
+For common configuration variables (not language specific), see `Configure the Datadog Tracing Library`_.
+
+
 Unified Service Tagging
 -----------------------
 
@@ -177,18 +185,6 @@ Traces
       version_added:
          v2.17.0:
 
-   DD_TRACE_ENABLED:
-     type: Boolean
-     default: True
-
-     description: |
-         Enable sending of spans to the Agent. Note that instrumentation will still be installed and spans will be
-         generated.
-
-     version_added:
-       v0.41.0: |
-           Formerly named ``DATADOG_TRACE_ENABLED``
-
    DD_TRACE_HEADER_TAGS:
      description: |
          A map of case-insensitive http headers to tag names. Automatically applies matching header values as tags on request and response spans. For example if
@@ -882,6 +878,8 @@ Other
 
 .. _Unified Service Tagging: https://docs.datadoghq.com/getting_started/tagging/unified_service_tagging/
 
+.. _Configure the Datadog Tracing Library: https://docs.datadoghq.com/tracing/trace_collection/library_config/
+
 
 Profiling
 ---------