Removed trailing slashes in NFC examples URL

This apparently breaks the examples.py script.

Author: Cruz Monrreal

tools/test/examples/examples.json

@@ -295,8 +295,8 @@
         "name": "mbed-os-example-nfc",
         "github": "https://github.com/ARMmbed/mbed-os-example-nfc",
         "mbed": [
-            "https://os.mbed.com/teams/mbed-os-examples/code/mbed-os-example-nfc-EEPROM/",
-            "https://os.mbed.com/teams/mbed-os-examples/code/mbed-os-example-nfc-SmartPoster/"
+            "https://os.mbed.com/teams/mbed-os-examples/code/mbed-os-example-nfc-EEPROM",
+            "https://os.mbed.com/teams/mbed-os-examples/code/mbed-os-example-nfc-SmartPoster"
         ],
         "test-repo-source": "mbed",
         "features" : [],