Update docs

src/BeagleBone/GPIO.jl

@@ -66,7 +66,8 @@ function read(gpio::GPIO, operation::Int32, debug::Bool=false)
   return l
 end
 
-""" teardown(gpio::GPIO, debug::Bool=false)
+"""
+    teardown(gpio::GPIO, debug::Bool=false)
 Closes all open streams on the GPIO, and unexports it from the file system.
 """
 function teardown(gpio::GPIO, debug::Bool=false)
@@ -124,6 +125,7 @@ end
 
 """
     to_string(gpio::GPIO, debug::Bool=false)
+
 Generates a string representation of the GPIO device.
 """
 function to_string(gpio::GPIO, debug::Bool=false)