Copy edit readme.md

Extend copy edits.

Author: Amanda Butler

TEST_APPS/readme.md

@@ -3,11 +3,12 @@
 ### Structure
 
 Mbed OS has a folder called `TEST_APPS` that contains everything related to Icetea testing.
-There are currently 3 folders:
 
-- `device` - contains all the different test applications you can flash to your board
-- `icetea_plugins` - contains plugins that are being used by some of the testcases, needed for the test execution
-- `testcases` - contains Icetea testcases written in Python
+There are currently three folders:
+
+- `device` - contains all the different test applications you can flash to your board.
+- `icetea_plugins` - contains plugins that are being used by some of the testcases, needed for the test execution.
+- `testcases` - contains Icetea testcases written in Python.
 
 The testcases depend on test applications.
 
@@ -19,15 +20,17 @@ You need Icetea and version 1.8.0 or higher of Mbed CLI installed.
 
 #### Selecting the network interface to use
 
-Depending on the device, there might be a default network interface type defined in `mbed-os/targets/targets.json`, which is used to locate a default test-config file.
-If default network interface type is not defined, or you want to use a different interface than the default, you need to provide a test-config file to the mbed test with `--test-config` option.
+Depending on the device, there might be a default network interface type defined in `mbed-os/targets/targets.json`, which you can use to locate a default test-config file.
+
+If the default network interface type is not defined or you want to use a different interface than the default, you need to provide a test-config file to the mbed test with `--test-config` option.
 
 The test-config file contains the necessary information for the test application. There are some test-config files located under `mbed-os/tools/test_configs`.
-Devices which have their network drivers residing inside mbed-os can use generic test_configs like `HeapBlockDeviceAndEthernetInterface.json` and `HeapBlockDeviceAndWifiInterface.json`. Otherwise you need to use a device specific test-config.
+
+Devices that have their network drivers residing inside `mbed-os` can use generic `test_configs`, such as `HeapBlockDeviceAndEthernetInterface.json` and `HeapBlockDeviceAndWifiInterface.json`. Otherwise, you need to use a device-specific test-config.
 
 ### Running the tests
 
-Now that the interface has been selected you can run the icetea tests from the mbed-os root on your command line by running the following command:
+Now that you have selected the interface, you can run the Icetea tests from the `mbed-os` root on your command-line by running the following command:
 
 `mbed test -m <target> -t <toolchain> --icetea`
 
@@ -40,20 +43,25 @@ If you only want to run some specific tests, you can use the `-n` option. You ca
 #### Running the tests with a specific test-config
 
 Some devices may offer multiple network interfaces to operate with. For example, `UBLOX_EVK_ODIN_W2` offers ethernet and Wi-Fi capabilities.
+
 The tests can be run for either one of those using already existing test-config -files.
 
 To run the tests with the Wi-Fi interface:
+
 `mbed test -m UBLOX_EVK_ODIN_W2 -t <toolchain> --icetea --test-config tools/test_configs/HeapBlockDeviceAndWifiInterface.json`
 
 To run the tests with the ethernet interface:
+
 `mbed test -m UBLOX_EVK_ODIN_W2 -t <toolchain> --icetea --test-config tools/test_configs/HeapBlockDeviceAndEthernetInterface.json`
 
 #### Providing Wi-Fi access point information
 
 If you are using the Wi-Fi interface for running the tests, you need to also provide information about the used access point.
+
 The information can be provided in the used test-config file.
 
 Example of access point information:
+
 ```
     "target_overrides": {
         "*": {
@@ -67,7 +75,7 @@ Example of access point information:
 
 ### Test results
 
-Icetea prints the results from the test run to the command line, and the final result looks similar to this.
+Icetea prints the results from the test run to the command-line, and the final result looks similar to this:
 
 ```
 +--------------------------------+---------+-------------+-------------+-----------+----------+
@@ -90,5 +98,6 @@ Icetea prints the results from the test run to the command line, and the final r
 +---------------+----------------+
 ```
 
-The results from the tests can also be found in the mbed-os/log folder.
-You probably want to add the log folder to your .mbedignore file to prevent issues with build commands becoming too long over the time.
+You can also find the results from the tests in the `mbed-os/log` folder.
+
+You probably want to add the log folder to your `.mbedignore` file to prevent issues with build commands becoming too long over the time.