[MPlayer-DOCS] Header levels in dload.src.en

[Diego Biurrun]

Torinthiel writes:
> Why is CVS and 'Older MPlayer versions' tagged <h3> and the nearest <h2>
> above is skins? IMHO either move it under <h2>Source</h2> or promote to <h2>.

There is no good reason.  Thanks, fixed.

Diego