[docs] update documentation [ci skip] (#393)

docs/Customization/Heterogeneous-SoCs.rst

@@ -19,7 +19,7 @@ The following example shows a dual core BOOM with a single core Rocket.
     :end-before: DOC include end: DualBoomAndRocket
 
 In this example, the ``WithNBoomCores`` and ``WithNBigCores`` mixins set up the default parameters for the multiple BOOM and Rocket cores, respectively.
-However, for BOOM, an extra mixin called ``LargeBoomConfig`` is added to override the default parameters with a different set of more common default parameters.
+However, for BOOM, an extra mixin called ``WithLargeBooms`` is added to override the default parameters with a different set of more common default parameters.
 This mixin applies to all BOOM cores in the system and changes the parameters for each.
 
 Great! Now you have a heterogeneous setup with BOOMs and Rockets.
@@ -55,8 +55,12 @@ Then you could use this new mixin like the following.
 .. code-block:: scala
 
     class SixCoreConfig extends Config(
-      new WithTop ++
+      new WithTSI ++
+      new WithNoGPIO ++
       new WithBootROM ++
+      new WithUART ++
+      new freechips.rocketchip.subsystem.WithNoMMIOPort ++
+      new freechips.rocketchip.subsystem.WithNoSlavePort ++
       new WithHeterCoresSetup ++
       new freechips.rocketchip.system.BaseConfig)