docs: update README for command syntax and binary execution (#1897)

## What kind of change does this PR introduce?

docs: update README for command syntax and binary execution
Add any other context or screenshots.

Author: zhenyu-hong

README.md

@@ -30,12 +30,12 @@ Create a `.env` file to store your own custom env vars. See [`example.env`](exam
 1. Start the local postgres database in a postgres container: `docker-compose -f docker-compose-dev.yml up postgres`
 2. Build the auth binary: `make build` . You should see an output like this:
 
-```
+```bash
 go build -ldflags "-X github.com/supabase/auth/cmd.Version=`git rev-parse HEAD`"
 GOOS=linux GOARCH=arm64 go build -ldflags "-X github.com/supabase/auth/cmd.Version=`git rev-parse HEAD`" -o gotrue-arm64
 ```
 
-3. Execute the auth binary: `./gotrue`
+3. Execute the auth binary: `./auth`
 
 ### If you have docker installed