[README] Coarse sweep to use markup in READMEs.

This should improve online readability of the readme files.

examples/stm32/f1/lisa-m-1/can/README.md

@@ -1,3 +1,5 @@
+# README
+
 This test sets up the CAN interface on Lisa/M and transmits 8 bites every
 100ms. The first byte is being incremented in each cycle. The demo also
 receives messages and is displaing the first 4 bits of the first byte on the

examples/stm32/f1/lisa-m-1/usb_cdcacm/README.md

@@ -1,6 +1,4 @@
-------------------------------------------------------------------------------
-README
-------------------------------------------------------------------------------
+# README
 
 This example implements a USB CDC-ACM device (aka Virtual Serial Port)
 to demonstrate the use of the USB device stack.

examples/stm32/f1/lisa-m-1/usb_dfu/README.md

@@ -1,6 +1,4 @@
-------------------------------------------------------------------------------
-README
-------------------------------------------------------------------------------
+# README
 
 This example implements a USB Device Firmware Upgrade (DFU) bootloader
 to demonstrate the use of the USB device stack.

examples/stm32/f1/lisa-m-1/usb_hid/README.md

@@ -1,6 +1,4 @@
-------------------------------------------------------------------------------
-README
-------------------------------------------------------------------------------
+# README
 
 This example implements a USB Human Interface Device (HID)
 to demonstrate the use of the USB device stack.