Fix link in FATFileSystem.md

Fix link in example.

Author: Amanda Butler

docs/reference/api/storage/FATFileSystem.md

@@ -34,7 +34,7 @@ You can swap the FAT file system in place with other Mbed OS file systems, which
 
 ### FATFileSystem example
 
-[![View code](https://www.mbed.com/embed/?url=https://github.com/armmbed/mbed-os-example-filesystem)](https://os.mbed.com/teams/mbed-os-examples/code/mbed-os-example-filesystem/file/adaa6c01d727/main.cpp/)
+[![View code](https://www.mbed.com/embed/?url=https://github.com/armmbed/mbed-os-example-filesystem)](https://os.mbed.com/teams/mbed-os-examples/code/mbed-os-example-filesystem/file/adaa6c01d727/main.cpp)
 
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