Adds missed ending quote to .cargo/config

.cargo/config

 [target.'cfg(all(target_arch = "arm", target_os = "none"))']
-runner = "arm-none-eabi-gdb -q -x openocd.gdb
+#runner = "arm-none-eabi-gdb -q -x openocd.gdb"
 
 # debian-based distros have transitioned to gdb-multiarch
-# runner = "gdb-multiarch -q -x openocd.gdb"
+runner = "gdb-multiarch -q -x openocd.gdb"
 
 rustflags = [
   "-C", "link-arg=-Tlink.x",