[TASK] Adopt order of cols in ext:documentation

Each of the actions 'show' and 'download' got a different sorting of the
columns. Change the order of the download action so that the action links
are placed at the end.

Change-Id: Ifa8aa7ed2eb9bee1ebbc086607ce1261fe1a3c95
Resolves: #54840
Releases: 6.2
Reviewed-on: https://review.typo3.org/26712
Reviewed-by: Georg Ringer
Tested-by: Georg Ringer