docs: remove link to NS4150 datasheet

examples/peripherals/i2s/i2s_basic/i2s_pdm/README.md

@@ -123,7 +123,7 @@ Please refer to the [Datasheet of MAX98358](https://datasheets.maximintegrated.c
 
 **NS4150**
 
-Please refer to the [Datasheet of NS4150](http://www.nsiway.com.cn/product/44.html) for more details.
+Please refer to the NS4150 datasheet for more details.
 
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