docs: add --conn to risc0 example (#603)

Author: JuArce

docs/guides/0_submitting_proofs.md

@@ -155,6 +155,7 @@ aligned submit \
 --proving_system Risc0 \
 --proof ./scripts/test_files/risc_zero/fibonacci_proof_generator/risc_zero_fibonacci.proof \
 --vm_program ./scripts/test_files/risc_zero/fibonacci_proof_generator/fibonacci_id.bin \
+--conn wss://batcher.alignedlayer.com \
 --aligned_verification_data_path ~/.aligned/aligned_verification_data \
 --keystore_path ~/.aligned_keystore/keystore0
 ```