Fix example link in SlicingBlockDevice.md

Update example link because source repo structure changed.

Author: Amanda Butler

docs/api/storage/SlicingBlockDevice.md

@@ -20,7 +20,7 @@ To configure this class, please see our [BlockDevice configuration documentation
 
 This SlicingBlockDevice example partitions a [HeapBlockDevice](heapblockdevice.html) into three subunits and showcases programming and reading back data segments through both the underlying master block device and the sliced subunits.
 
-[![View code](https://www.mbed.com/embed/?url=https://github.com/ARMmbed/mbed-os-examples-docs_only/tree/master/SlicingBlockDevice/)](https://github.com/ARMmbed/mbed-os-examples-docs_only/tree/master/SlicingBlockDevice/main.cpp)
+[![View code](https://www.mbed.com/embed/?url=https://github.com/ARMmbed/mbed-os-examples-docs_only/blob/master/blockdevices/SlicingBlockDevice/)](https://github.com/ARMmbed/mbed-os-examples-docs_only/blob/master/blockdevices/SlicingBlockDevice/main.cpp)
 
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