Update findata-permit.md

[inkeuutela]

Proposed changes

preview: https://csc-guide-preview.2.rahtiapp.fi/origin/sd-video-changes/data/sensitive-data/findata-permit/

Briefly describe the changes you've made here. Remember to add a link to the preview page of your branch.

Checklist before requesting a review

• I have followed the instructions in the Contributing and Styleguide documents.
• My pull request passes the automated tests. If not, visit pull requests at Travis CI and have a look at the job log.
• I have included a link to the appropriate preview page (select your branch from the list).

[meericsc]

ok