Fix typo

Author: zoffixznet

doc/Type/IO/Handle.pod6

@@ -74,7 +74,7 @@ collection happens and the no longer used handles get closed.
 
 Defined as:
 
-    method eof(IO::Handle:D: --> Bool:Ds);
+    method eof(IO::Handle:D: --> Bool:D);
 
 Returns C<True> if the read operations have exhausted the contents of the
 handle.