docs: say what each client does instead of "run the demo"

api-proxy/client.py

@@ -37,7 +37,9 @@
 
 
 def _parse_args() -> argparse.Namespace:
-    parser = argparse.ArgumentParser(description="Run the api-proxy Live Runner demo.")
+    parser = argparse.ArgumentParser(
+        description="Send a prompt to an api-proxy Live Runner and save the image."
+    )
     parser.add_argument(
         "--prompt", default="a watercolor painting of a llama writing code"
     )

echo/client.py

@@ -55,7 +55,7 @@
 
 def _parse_args() -> argparse.Namespace:
     parser = argparse.ArgumentParser(
-        description="Run the proxied echo Live Runner demo."
+        description="Send video through an echo Live Runner and read it back."
     )
     parser.add_argument(
         "input",

hello-world/client.py

@@ -27,7 +27,7 @@
 
 def _parse_args() -> argparse.Namespace:
     parser = argparse.ArgumentParser(
-        description="Run the hello-world Live Runner demo."
+        description="Call a hello-world Live Runner and print the reply."
     )
     parser.add_argument("--discovery", default=DEFAULT_DISCOVERY)
     parser.add_argument("--name", default="livepeer")

tiles/client.py

@@ -48,7 +48,7 @@
 
 def _parse_args() -> argparse.Namespace:
     parser = argparse.ArgumentParser(
-        description="Run the tiles Live Runner demo (capacity showcase)."
+        description="Split an image, stylize each tile on a Live Runner, stitch it back."
     )
     parser.add_argument("input", help="input image file (png/jpg)")
     parser.add_argument("--output", default=DEFAULT_OUTPUT, help="output image path")