README.md: Remove coroutine references.

Author: paulbartell

README.md

@@ -1,5 +1,5 @@
 ## Getting started
-This repository contains FreeRTOS kernel source/header files and kernel ports only. This repository is referenced as a submodule in [FreeRTOS/FreeRTOS](https://github.com/FreeRTOS/FreeRTOS) repository, which contains pre-configured demo application projects under ```FreeRTOS/Demo``` directory. 
+This repository contains FreeRTOS kernel source/header files and kernel ports only. This repository is referenced as a submodule in [FreeRTOS/FreeRTOS](https://github.com/FreeRTOS/FreeRTOS) repository, which contains pre-configured demo application projects under ```FreeRTOS/Demo``` directory.
 
 The easiest way to use FreeRTOS is to start with one of the pre-configured demo application projects.  That way you will have the correct FreeRTOS source files included, and the correct include paths configured.  Once a demo application is building and executing you can remove the demo application files, and start to add in your own application source files.  See the [FreeRTOS Kernel Quick Start Guide](https://www.FreeRTOS.org/FreeRTOS-quick-start-guide.html) for detailed instructions and other useful links.
 
@@ -66,19 +66,18 @@ git clone [email protected]:FreeRTOS/FreeRTOS-Kernel.git
 ```
 
 ## Repository structure
-- The root of this repository contains the three files that are common to 
-every port - list.c, queue.c and tasks.c.  The kernel is contained within these 
-three files.  croutine.c implements the optional co-routine functionality - which
-is normally only used on very memory limited systems.
+- The root of this repository contains the three files that are common to
+every port - list.c, queue.c and tasks.c.  The kernel is contained within these
+three files.
 
-- The ```./portable``` directory contains the files that are specific to a particular microcontroller and/or compiler. 
+- The ```./portable``` directory contains the files that are specific to a particular microcontroller and/or compiler.
 See the readme file in the ```./portable``` directory for more information.
 
 - The ```./include``` directory contains the real time kernel header files.
 
 ### Code Formatting
-FreeRTOS files are formatted using the "uncrustify" tool. The configuration file used by uncrustify can be found in the [FreeRTOS/FreeRTOS repository](https://github.com/FreeRTOS/FreeRTOS/blob/main/tools/uncrustify.cfg). 
+FreeRTOS files are formatted using the "uncrustify" tool. The configuration file used by uncrustify can be found in the [FreeRTOS/FreeRTOS repository](https://github.com/FreeRTOS/FreeRTOS/blob/main/tools/uncrustify.cfg).
 
 ### Spelling
-*lexicon.txt* contains words that are not traditionally found in an English dictionary. It is used by the spellchecker to verify the various jargon, variable names, and other odd words used in the FreeRTOS code base. If your pull request fails to pass the spelling and you believe this is a mistake, then add the word to *lexicon.txt*. 
+*lexicon.txt* contains words that are not traditionally found in an English dictionary. It is used by the spellchecker to verify the various jargon, variable names, and other odd words used in the FreeRTOS code base. If your pull request fails to pass the spelling and you believe this is a mistake, then add the word to *lexicon.txt*.
 Note that only the FreeRTOS Kernel source files are checked for proper spelling, the portable section is ignored.