Incorporate PR feedback

Author: petergrossmann21

doc/src/vpr/command_line_usage.rst

@@ -202,17 +202,12 @@ General Options
 
     Specifies which device layout/floorplan to use from the architecture file.  Valid values are:
 
-    * ``auto`` VPR uses the smallest device satisfying the circuit's resource requirements, with device layout specified using the ``auto_layout`` section of the architecture file.
-    * Any string matching ``name`` attribute of a device layout defined with a ``fixed_layout`` tag in the :ref:`arch_grid_layout` section of the architecture file.
+    * ``auto`` VPR uses the smallest device satisfying the circuit's resource requirements.  This option will use the ``<auto_layout>`` tag if it is present in the architecture file in order to construct the smallest FPGA that has sufficient resources to fit the design. If the ``<auto_layout>`` tag is not present, the ``auto`` option chooses the smallest device amongst all the architecture file's ``<fixed_layout>`` specifications into which the design can be packed.
+    * Any string matching ``name`` attribute of a device layout defined with a ``<fixed_layout>`` tag in the :ref:`arch_grid_layout` section of the architecture file.
 
     If the value specified is neither ``auto`` nor matches the ``name`` attribute value of a ``<fixed_layout>`` tag, VPR issues an error.
-
-    In the event that no ``<auto_layout>`` tag is present in the architecture file, this option has the following behaviour:
-
-    * ``auto`` VPR uses the smallest device amongst all ``fixed_layout`` specifications into which the design can be packed.
-    * Otherwise, the value of the ``fixed_layout`` attribute ``name`` is matched as when an ``<auto_layout>`` tag is present.
-    
-   .. note:: If the only layout in the architecture file is a single device specified using ``<fixed_layout>``, it is recommended to always specify the ``--device`` option; this prevents the value ``--device auto`` from interfering with operations supported only for ``<fixed_layout>`` grids.
+       
+    .. note:: If the only layout in the architecture file is a single device specified using ``<fixed_layout>``, it is recommended to always specify the ``--device`` option; this prevents the value ``--device auto`` from interfering with operations supported only for ``<fixed_layout>`` grids.
 
     **Default:** ``auto``