Merge pull request #76 from cygx/patch-1

fix typo s/rule/role/

Author: paultcochrane

lib/Type/Buf.pod

@@ -4,7 +4,7 @@
 
 =SUBTITLE Mutable buffer for binary data
 
-    rule Buf[::T] does Blob[T] { ... }
+    role Buf[::T] does Blob[T] { ... }
 
 A C<Buf> is a mutable sequence of (usually unsigned) integers.