fix: backend name

Signed-off-by: grorge <[email protected]>

Author: grorge123

docs/contribute/source/plugin/wasi_nn.md

@@ -319,7 +319,7 @@ cmake --build build
 cmake --install build
 ```
 
-Then you will have an executable `wasmedge` runtime under `/usr/local/bin` and the WASI-NN with OpenVINO backend plug-in under `/usr/local/lib/wasmedge/libwasmedgePluginWasiNN.so` after installation.
+Then you will have an executable `wasmedge` runtime under `/usr/local/bin` and the WASI-NN with Neural Speed backend plug-in under `/usr/local/lib/wasmedge/libwasmedgePluginWasiNN.so` after installation.
 
 ### Appendix