update docs

docs/basic_usage.rst

@@ -3,39 +3,19 @@
 Basic Usage
 ===========
 
-Tracing
-~~~~~~~
+Automatic Instrumentation
+~~~~~~~~~~~~~~~~~~~~~~~~~
 
 ``ddtrace.auto``
 ----------------
 
-To set up instrumentation within your application, call :ref:`import ddtrace.auto<ddtraceauto>` as early as possible
+To enable full ddtrace support (library instrumentations, profiling, application security monitoring, dynamic instrumentation, etc.) call :ref:`import ddtrace.auto<ddtraceauto>` as early as possible
 in your application. This will only work if your application is not running under ``ddtrace-run``.
 
-``patch_all``
--------------
-
-For fine-grained control over instrumentation setup, use ``patch_all`` as early as possible
-in the application::
-
-  from ddtrace import patch_all
-  patch_all()
-
-To toggle instrumentation for a particular module::
-
-  from ddtrace import patch_all
-  patch_all(redis=False, cassandra=False)
-
-By default all supported libraries will be instrumented when ``patch_all`` is
-used.
-
-**Note:** To ensure that the supported libraries are instrumented properly in
-the application, they must be patched *prior* to being imported. So make sure
-to call ``patch_all`` *before* importing libraries that are to be instrumented.
-
-More information about ``patch_all`` is available in the :py:func:`patch_all<ddtrace.patch_all>` API
-documentation.
+Note: Some Datadog products and instrumentations are disabled by default. Most datadog products and instrumentations can be enabled/disable via environment variables, see :ref:`configurations <Configuration>` page for more details.
 
+Tracing
+~~~~~~~
 
 Manual Instrumentation
 ----------------------