Update READMEs to match current samples

Author: voltur01

samples/README.md

@@ -6,7 +6,6 @@ Embedded Toolchain for Arm.
 ## Directory structure
 
 * `ldscripts` - Linker scripts used by the samples.
-* `startup` - Startup code used by the samples.
 * `src` - Sample source code, Makefile and description, each sub-directory is a
   separate sample.
 
@@ -24,16 +23,7 @@ In order to compile the samples you will need the following tools:
 * GNU Make (Linux and MSYS2)
 
 To run the samples you will need a QEMU emulator to be installed on your
-machine. The ``basic-semihosting`` sample uses the QEMU User space emulator,
-on Ubuntu Linux it can be installed using the following command:
-
-```
-# apt-get install qemu-user
-```
-
-The User space emulator is only available for Linux.
-
-The other two samples (``baremetal-semihosting`` and ``baremetal-uart``) rely on
+machine. The samples rely on
 the QEMU Arm System emulator. On Ubuntu Linux it can be installed as follows:
 
 ```

samples/src/baremetal-semihosting/README.md

@@ -4,6 +4,3 @@ This sample shows how to use semihosting with
 [QEMU Arm System emulator](https://www.qemu.org/docs/master/system/target-arm.html)
 targeting the
 [micro:bit board model](https://www.qemu.org/2019/05/22/microbit/).
-
-It uses the startup code and the linker script file from the GNU Arm Embedded
-Toolchain samples.

samples/src/baremetal-uart/README.md

@@ -5,7 +5,4 @@ This sample shows how to use
 without semihosting targeting the
 [micro:bit board model](https://www.qemu.org/2019/05/22/microbit/).
 
-It uses the startup code and the linker script file from the GNU Arm Embedded
-Toolchain samples.
-
-_Note: The sample code hangs at the end of the execution in an infinite loop!_
+_Note: The sample code hangs at the end of the execution in an infinite loop! Use ``Ctrl-a x`` to terminate._

samples/src/cpp-baremetal-semihosting/README.md

@@ -5,6 +5,3 @@ This sample shows how to use semihosting with
 targeting the
 [micro:bit board model](https://www.qemu.org/2019/05/22/microbit/)
 to build C++ programs.
-
-It uses the startup code and the linker script file from the GNU Arm Embedded
-Toolchain samples.