Update docs/embedded/flexpret.mdx

Co-authored-by: erling <[email protected]>

Author: magnmaeh

docs/embedded/flexpret.mdx

@@ -17,13 +17,7 @@ As a developer, you should be aware of a significant difference between FlexPRET
 ```
 git clone --recurse-submodules https://github.com/lf-lang/lf-flexpret-template lf-flexpret-workspace && cd lf-flexpret-workspace
 ```
-2. Source the `env.bash` or `env.fish` to set up necessary environment variables. You will need to do this every time, so it could be a good idea to add this to your `~/.bashrc`.
-```
-source env.bash
-```
-```
-source env.fish
-```
+2. Source the `env.bash` to set up necessary environment variables. You will need to do this every time, so it could be a good idea to add this to your `~/.bashrc`.
 
 ## FlexPRET build