Merge pull request #41 from ARMmbed/AnotherButler-patch-11

Add link to README.md

Author: Amanda Butler

blockdevices/SDBlockDevice/README.md

@@ -1,4 +1,3 @@
 # SDBlockDevice example
 
-SDBlockDevice usage example for Mbed OS
-
+This example demonstrates SDBlockDevice usage for Mbed OS. To see this example in context, please see its [published documentation](https://os.mbed.com/docs/mbed-os/latest/apis/sdblockdevice.html).