Corrected the docs for method s in IO::Path. This closes #1054.

doc/Type/IO/Path.pod6

@@ -252,9 +252,13 @@ Returns C<Bool::True> if the invocant is a path and the file exists.
 
 =head2 method s
 
-    method s(--> Bool)
+    method s(--> Int)
 
-Returns C<Bool::True> if the invocant is a path and the size is bigger then 0.
+If the path is valid and points to a regular file the size of that file
+in bytes is returned. If the path is valid but pointing to something which
+is not a file, e.g. a directory, a L<X::IO::NotAFile> exception is thrown.
+An exception is also thrown if the path is invalid, in that case the exception
+type is L<X::IO::DoesNotExist>.
 
 =head2 method l