Fix arm tut (nasa#2962)

* removed sudo as it's no longer needed

* Updated to use json instead of xml since we are moving away from xml

Author: kevin-f-ortega

docs/Tutorials/CrossCompilationSetup/ArmLinuxTutorial.md

@@ -16,16 +16,16 @@ scp -r build-artifacts/arm-hf-linux/<name-of-deployment> <username>@<device-addr
 > Users must fill in the username and device address above.
 
 Next run the F´ GDS without launching the native compilation (`-n`) and with the 
-dictionary from the build above (`--dictionary ../build-artifacts/<platform name>/<name-of-deployment>/dict/<.xml document>`).
+dictionary from the build above (`--dictionary ../build-artifacts/<platform name>/<name-of-deployment>/dict/<.json document>`).
 
 ```sh
 # For in-person workshops and ARM 64-bit hardware
 # In: project root folder
-fprime-gds -n --dictionary build-artifacts/aarch64-linux/<name-of-deployment>/dict/<App Dictionary>.xml --ip-client --ip-address <device-address>
+fprime-gds -n --dictionary build-artifacts/aarch64-linux/<name-of-deployment>/dict/<App Dictionary>.json --ip-client --ip-address <device-address>
 
 # For ARM 32-bit hardware
 # In: project root folder
-fprime-gds -n --dictionary build-artifacts/aarch64-linux/<name-of-deployment>/dict/<App Dictionary>.xml --ip-client --ip-address <device-address>
+fprime-gds -n --dictionary build-artifacts/aarch64-linux/<name-of-deployment>/dict/<App Dictionary>.json --ip-client --ip-address <device-address>
 ```
 > This depends on a flight software deployment that uses TcpServer as the communications driver implementation.