Format eve7 tutorials

[couet]

The 'author' line was missing in severel eve7 tutorials.
Therefore they appeared badly formatted in the ROOT documentation.

[linev]

One need add "Alja Mrak Tadel" as author of the tutorials.
She create most of them.
Just see modifications history for all of them.

Maybe @alja or @osschar can comment as well

[github-actions]

Test Results

    23 files      23 suites   3d 13h 18m 46s ⏱️
 3 853 tests  3 852 ✅ 0 💤 1 ❌
78 505 runs  78 503 ✅ 1 💤 1 ❌

For more details on these failures, see this check.

Results for commit 0e16a5c.