Update/reword main QUICK_START and READMEs

Author: agners

docs/QUICK_START.md

@@ -10,7 +10,7 @@ and platforms.
 | <div style="width:200px">Controller / Admin</div>                                                                                                                                     | <div style="width:200px">Node</div>                                                                                                                                                                                                                                 | Description                                                                                                                                                                               |
 | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
 | [**chip-tool**](https://github.com/project-chip/connectedhomeip/blob/master/examples/chip-tool/README.md) (Linux / Mac)<br> Includes docs for all the cluster commands supported <br> | **all-clusters-app** <li> [M5Stack](https://github.com/project-chip/connectedhomeip/blob/master/examples/all-clusters-app/esp32/README.md) (ESP)<li>[Linux](https://github.com/project-chip/connectedhomeip/tree/master/examples/all-clusters-app/linux) simulation | Use the command line tool on a laptop to pair with and control an embedded Wi-Fi platform. This demo supports the “all-clusters-app”, so it provides the basic onoff light test and more. |
-| [**chip-device-ctrl.py**](https://github.com/project-chip/connectedhomeip/blob/master/src/controller/python/README.md)                                                                | **all-clusters-app**<li> [M5Stack](https://github.com/project-chip/connectedhomeip/blob/master/examples/all-clusters-app/esp32/README.md) (ESP)<li> [Linux](https://github.com/project-chip/connectedhomeip/tree/master/examples/all-clusters-app/linux) simulation | Same as above, but uses the pychip tool as Controller Node.                                                                                                                               |
+| [**chip-repl**](https://github.com/project-chip/connectedhomeip/blob/master/src/controller/python/README.md)                                                                          | **all-clusters-app**<li> [M5Stack](https://github.com/project-chip/connectedhomeip/blob/master/examples/all-clusters-app/esp32/README.md) (ESP)<li> [Linux](https://github.com/project-chip/connectedhomeip/tree/master/examples/all-clusters-app/linux) simulation | Same as above, but uses the Python CHIP REPL as Controller Node.                                                                                                                          |
 
 ## Thread Nodes
 

docs/guides/python_chip_controller_building.md

@@ -1,7 +1,7 @@
 # Working with Python CHIP Controller
 
-The Python CHIP Controller is a tool that allows to commission a Matter device
-into the network and to communicate with it.
+The Python CHIP controller is a library that allows to create a Matter fabric
+and commission Matter devices with it.
 
 The `chip-repl` is a REPl which sets up a Python CHIP Controller and allows to
 explore the Python CHIP Controller API and communicate with devices from the

src/controller/README.md

@@ -26,7 +26,7 @@ The POSIX CLI chip-tool is located in
 
 ### Python
 
-The Python chip-device-ctrl is located in
+The Python CHIP Controller library is located in
 [../controller/python/](../controller/python).
 
 ## Feature Overview

src/controller/python/README.md

@@ -1,10 +1,14 @@
-# Python CHIP Device Controller
+# Python CHIP Controller
 
-The Python CHIP controller is a tool that allows to commission a Matter device
-into the network and to communicate with it using the Zigbee Cluster Library
-(ZCL) messages. The tool uses the generic [Chip Device Controller](../) library.
+The Python CHIP controller is a library that allows to create a Matter fabric
+and commission Matter devices with it, as well as communicate with commissioned
+devices by reading/subscribing and writing Attributes and sending Commands. The
+Python CHIP controller is based on the native [Chip Device Controller](../)
+library.
 
-To learn more about the tool, how to build it and use its commands and advanced
+The Python CHIP Controller comes with a REPL which allows to explore and use the
+Python CHIP controller library from a shell. To learn more about the Python CHIP
+Controller and the REPL, how to build it and use its commands and advanced
 features, read the following guides:
 
 -   [Working with Python CHIP Controller](../../../docs/guides/python_chip_controller_building.md)