kernelci: cli: docker: use gcc-12 instead of gcc-10

GCC-10 was dropped with the refactor, so just update cli to output
working command.

Signed-off-by: Ben Copeland <[email protected]>

Author: bhcopeland

kernelci/cli/docker.py

@@ -41,7 +41,7 @@ def kci_docker():
 
     The image and fragment names are positional arguments.  For example:
 
-        kci docker build gcc-10 --arch=x86 kernelci kselftest
+        kci docker build gcc-12 --arch=x86 kernelci kselftest
 
         kci docker generate kernelci
     """