doc: graph: sdpa: example and reference link for mqa

doc/graph/complex_fusion/sdpa.md

@@ -125,8 +125,16 @@ example](https://github.com/oneapi-src/oneDNN/tree/main/examples/graph/sdpa.cpp)
 demonstrating how to construct a typical floating point SDPA pattern with oneDNN
 Graph API on CPU and GPU with different runtimes.
 
+oneDNN also provides a [MQA (Multi-Query Attention)
+example](https://github.com/oneapi-src/oneDNN/tree/main/examples/graph/mqa.cpp) [3]
+demonstrating how to construct a floating point MQA pattern with the same
+pattern structure as in the SDPA example but different head number in Key and
+Value tensors. In MQA, the head number of Key and Value is always one.
+
 ## References
 
 [1] Attention is all you need, https://arxiv.org/abs/1706.03762v7
 
 [2] oneDNN Graph API documentation, https://oneapi-src.github.io/oneDNN/graph_extension.html
+
+[3] Fast Transformer Decoding: One Write-Head is All You Need, https://arxiv.org/abs/1911.02150