Revert "fixed ada code samples"

This reverts commit 9545bda98a74741fab9f96058fdaf90458d8569a.

Turns out that syntax highlighting was broken due to a bug
in pygments, not in the way my code was written.

The next version of pygments, 1.6 final, should contain my
fixed for highlighting record types. Until then, the correct
syntax is in the file, highlighting works using the pygments-HEAD