fix: Add missing arg to echo_full example and source cargo env in setup steps (#101)

launch/dynamo-run/README.md

@@ -12,6 +12,7 @@ apt install -y build-essential libhwloc-dev libudev-dev pkg-config libssl-dev pr
 Install Rust:
 ```
 curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
+source $HOME/.cargo/env
 ```
 
 ## Build
@@ -305,7 +306,7 @@ dynamo-run in=http out=echo_core --model-path <hf-repo-checkout>
 The `echo_full` engine accepts un-processed requests and echoes the prompt back as the response.
 
 ```
-dynamo-run in=http out=echo_full
+dynamo-run in=http out=echo_full --model-name my_model
 ```
 
 ### Configuration