Apply markdown-styling for better readability.

Author: aentinger

bootloaders/SANTIAGO/README.md

@@ -1,7 +1,8 @@
+:floppy_disk: `bootloaders/SANTIAGO`
+====================================
 Sources at git@github.com:bcmi-labs/tinyusb.git , commit b56afef9a86339a326cb208d9b2e6934befd6828
 
-Compiled with 
-
-  cd examples/device/dfu && make BOARD=ek_ra4m1
-
-
+Compiled with
+```bash
+cd examples/device/dfu && make BOARD=ek_ra4m1
+```