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>

package/binutils/Config.in.host

@@ -39,7 +39,7 @@ config BR2_BINUTILS_VERSION_2_35_X
 	depends on !BR2_BINFMT_FLAT
 
 config BR2_BINUTILS_VERSION_ARC
-	bool "binutils arc (2.31)"
+	bool "binutils arc (2.34.50)"
 	depends on BR2_arc
 
 config BR2_BINUTILS_VERSION_CSKY

package/gcc/Config.in.host

@@ -9,7 +9,7 @@ choice
 	  Select the version of gcc you wish to use.
 
 config BR2_GCC_VERSION_ARC
-	bool "gcc arc (9.x)"
+	bool "gcc arc (10.x)"
 	# Only supported architecture
 	depends on BR2_arc
 	select BR2_TOOLCHAIN_GCC_AT_LEAST_9