examples : remove outdated backend sampling section

This commit removes the outdated section about using backend samplers
from the README.md file in the examples/batched.

examples/batched/README.md

@@ -42,41 +42,3 @@ llama_print_timings: prompt eval time =  4089.11 ms /   118 tokens (   34.65 ms
 llama_print_timings:        eval time =     0.00 ms /     1 runs   (    0.00 ms per token,      inf tokens per second)
 llama_print_timings:       total time =  4156.04 ms
 ```
-
-### Using backend samplers
-It is possible to run this example using backend samplers so that sampling is
-performed on a backend device, like a GPU.
-```bash
-./llama-batched \
-    -m models/Qwen2.5-VL-3B-Instruct-Q8_0.gguf -p "Hello my name is" \
-    -np 4 \
-    -kvu \
-    --backend_sampling \
-    --samplers 'top_k;temperature' \
-    --top-k 80
-```
-The samplers specified with `--samplers` must be supported by the backend and
-this is why we are explicitly specifying only `top_k` and `temperature` here as
-at the time of writing these are supported.
-
-The `--verbose` flag can be added to see more detailed output and also show
-that the backend samplers are being used.
-
-With `--backend_sampling` enabled, the sampler chain is automatically analyzed
-to determine which samplers can run on the backend. The system finds the longest
-contiguous chain of backend-supported samplers from the start of the sampler
-sequence. For example:
-* If the chain is `top-k -> temperature -> top-p`, and both `top-k` and
-  `temperature` are backend-supported but `top-p` is not, then `top-k` and
-  `temperature` will run on the backend, while `top-p` and subsequent samplers
-  run on the CPU.
-* If all configured samplers are supported, the final distribution sampling will
-  also happen on the backend, transferring only the sampled token IDs back to the
-  host.
-* If the sampler chain starts with an unsupported sampler (e.g., `penalties`),
-  all sampling runs on the CPU.
-
-**Note:** The default sampler chain includes `penalties` as the first sampler,
-which is not backend-supported yet. To use backend sampling, you must explicitly
-configure a sampler chain that starts with backend-supported samplers using
-`--samplers` like shown above.