chore(docs): update avs operator register (#541)

removes need for flag decl

task: none

---------

Co-authored-by: ttarsi <31632172+ttarsi@users.noreply.github.com>

docs/site/docs/operate/testnet/register.md

@@ -35,5 +35,11 @@ chain_id: 100 # The chain ID of the Omni Network
 2. Run the following command to register as an operator:
 
 ```bash
-omni operator register --config-file ~/path/to/operator.yml --avs-address <AVS_CONTRACT_ADDRESS>
+omni operator register --config-file ~/path/to/operator.yml
 ```
+
+:::info
+
+The AVS address (`0x848BE3DBcd054c17EbC712E0d29D15C2e638aBCe`) is the address of the Omni AVS contract [deployed on Goerli testnet](https://goerli.etherscan.io/address/0x848BE3DBcd054c17EbC712E0d29D15C2e638aBCe) that will be called by the `register` command.
+
+:::