Update docs.json

Amanda Butler · web-flow · commit 32ae68f7f52a · 2018-03-13T18:12:54.000-05:00
Add USB.
diff --git a/docs.json b/docs.json
@@ -558,6 +558,10 @@
                         "type": "markdown",
                         "url": "https://github.com/ARMmbed/Handbook/blob/new_engine/docs/reference/contributing/target/sleep.md"
                     },
+                    {
+                        "type": "markdown",
+                        "url": "https://github.com/ARMmbed/Handbook/blob/new_engine/docs/reference/contributing/target/usb.md"
+                    },
                     {
                         "type": "markdown",
                         "url": "https://github.com/ARMmbed/Handbook/blob/new_engine/docs/reference/contributing/target/flash.md"
