Update index.php

[rob-wilco]

healt ---> health (typo fix)

##IMPORTANT: PLEASE READ

The best way to propose a feature is to open an issue on the community forum and discuss your
ideas there before implementing them: https://community.passbolt.com/

This is only a issue tracker for issues related to the Passbolt API.
For passbolt docker, browser extension, command line interface, in short any other issues
please use this the other relevant repositories.

Always follow the contribution guidelines when submitting a pull request.
In particular, make sure existing tests still pass, and add unit and selenium tests for all new behavior. When fixing a bug,
you may want to add a test to verify the fix.

Please follow the following format:

ISSUE NAME

This pull request is a (multiple allowed):

• bug fix
• change of existing behavior
• new feature

Checklist

• User stories are present (given, when, then format)
• Unit tests are passing
• Selenium tests are passing
• Check style is not triggering new error or warning

What you did

Describe the big picture of your changes here to communicate to the maintainers why we
should accept this pull request. If it fixes a bug or resolves a feature request, be sure
to link to that issue. (typo fix - healt ----> health

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}