more cargo doc fixes

Author: hudson-ayers

capsules/src/st77xx.rs

@@ -1,6 +1,6 @@
 //! ST77xx Screen
 //!
-//! - https://learn.adafruit.com/adafruit-1-3-and-1-54-240-x-240-wide-angle-tft-lcd-displays
+//! - <https://learn.adafruit.com/adafruit-1-3-and-1-54-240-x-240-wide-angle-tft-lcd-displays>
 //!
 //! The screen supports multiple physical busses, and this driver is implemented
 //! on top of the generic `Bus` interface.

capsules/src/usb/ctap.rs

@@ -1,6 +1,6 @@
 //! Client to Authenticator Protocol CTAPv2 over USB HID
 //!
-//! Based on the spec avaliable at: https://fidoalliance.org/specs/fido-v2.0-id-20180227/fido-client-to-authenticator-protocol-v2.0-id-20180227.html
+//! Based on the spec avaliable at: <https://fidoalliance.org/specs/fido-v2.0-id-20180227/fido-client-to-authenticator-protocol-v2.0-id-20180227.html>
 
 use core::cell::Cell;
 use core::cmp;

chips/earlgrey/src/aes.rs

@@ -1,6 +1,6 @@
 //! Support for the AES hardware block on OpenTitan
 //!
-//! https://docs.opentitan.org/hw/ip/aes/doc/
+//! <https://docs.opentitan.org/hw/ip/aes/doc/>
 
 use kernel::common::cells::{OptionalCell, TakeCell};
 use kernel::common::registers::{