Merge pull request #350 from cnjhb/master

docs(guide.md): remove binary buffers

Author: psychon

docs/guide.md

@@ -85,7 +85,6 @@ mapping between GLib types and Lua types is established.
   direction, following values are accepted for `gpointer` type:
     - Lua `string` instances
     - Instances of lgi classes, structs or unions
-    - Binary buffers (see below)
 
 ### 2.1. Calling functions and methods