toolchain: update option descriptions for ARC tools arc-2020.09-release
https://git.buildroot.net/buildroot/commit/?id=0791abfba0227803b19895ea22326f4e17ac93dc
bumped
* Binutils 2.34.50 with additional ARC patches
* GCC 10.0.2 with additional ARC patches
* GDB 10.0.50 with additional ARC patches
but forgot to update the version numbers stored in option descriptions.
Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>