cmake readme: fix toolchain names

Author: 0xc0170

cmake/README.md

@@ -15,13 +15,14 @@ These targets should work:
 
 ### Supported toolchains
 
-ARMClang6 and Gcc Arm toolchains are supported.
+Arm Compiler 6 and GNU Arm Embedded toolchains are supported.
 
 ### Examples
 
 Supported examples can be identified by the presence of a top level `CMakelists.txt` input source file. 
 
 ### Known issues
 
-- ARMClang6: the assembler does not include definitions. It will be fixed in the upcoming release (>3.18.2)
-- Ninja: ARMClang6 response files require unix paths on Windows, see https://gitlab.kitware.com/cmake/cmake/-/issues/21093
+- ARMClang6: the assembler does not include definitions. It will be fixed in the upcoming release (>3.18.2). Reference: https://gitlab.kitware.com/cmake/cmake/-/issues/21148#note_823305
+- Ninja: ARMClang6 response files require unix paths on Windows. Reference: https://gitlab.kitware.com/cmake/cmake/-/issues/21093
+