FIX / Docs: Fix GPTQ expected number of bits (huggingface#31111)

Update overview.md

docs/source/en/quantization/overview.md

@@ -52,7 +52,7 @@ Use the table below to help you decide which quantization method to use.
 | [bitsandbytes](./bitsandbytes)                        | 🟢                       | 🔴   |     🟢     | 🔴              | 🔴                     | 🔴                       | 4 / 8          | 🟢                                   | 🟢            | 🟢                      | https://github.com/TimDettmers/bitsandbytes |
 | [EETQ](./eetq)                                | 🟢                       | 🔴   | 🟢        | 🔴              | 🔴                     | ?                       | 8              | 🟢                                   | 🟢            | 🟢                      | https://github.com/NetEase-FuXi/EETQ        |
 | GGUF / GGML (llama.cpp)             | 🟢                       | 🟢   | 🟢        | 🔴              | 🟢                     | 🔴                       | 1 - 8          | 🔴                                   | [See GGUF section](../gguf)                | [See GGUF section](../gguf)                      | https://github.com/ggerganov/llama.cpp      |
-| [GPTQ](./gptq)                                | 🔴                       | 🔴   | 🟢        | 🟢              | 🔴                     | 🔴                       | 4 / 8          | 🟢                                   | 🟢            | 🟢                      | https://github.com/AutoGPTQ/AutoGPTQ        |
+| [GPTQ](./gptq)                                | 🔴                       | 🔴   | 🟢        | 🟢              | 🔴                     | 🔴                       | 2 - 3 - 4 - 8          | 🟢                                   | 🟢            | 🟢                      | https://github.com/AutoGPTQ/AutoGPTQ        |
 | [HQQ](./hqq)                                 | 🟢                       | 🟢    | 🟢        | 🔴              | 🔴                     | 🟢                       | 1 - 8          | 🟢                                   | 🔴            | 🟢                      | https://github.com/mobiusml/hqq/            |
 | [Quanto](./quanto)                              | 🟢                       | 🟢   | 🟢        | 🔴              | 🟢                     | 🟢                       | 2 / 4 / 8      | 🔴                                   | 🔴            | 🟢                      | https://github.com/huggingface/quanto       |