Path typo and make target typo in getting-started.rst
Path typo and make target typo in getting-started.rst

Signed-off-by: Craig Comstock <c4b5a8c0fafd56ae12499ba1d5d55022dbe4108e@unreasonablefarm.org>

SymbiFlow/symbiflow-arch-defs,SymbiFlow/symbiflow-arch-defs