docs(users): using Google for SAML auth

[cloudrootab]

I noticed that the SAML-docs I wrote, could use some tweaking. To make it more helpfull. So I added a few points to better point to where to find this inside Googles admin dashboard.

Also. Added a small note about a potential certificate error, if there isn't a newline at the bottom of the certificate field.

Description

Short explanation of this PR (feel free to re-use commit message)

Checklist

• Commit
  • Title follows commit conventions
  • Reference the relevant issue (Fixes #007, See xoa-support#42, See https://...)
  • If bug fix, add Introduced by
• Changelog
  • If visible by XOA users, add changelog entry
  • Update "Packages to release" in CHANGELOG.unreleased.md
• PR
  • If UI changes, add screenshots
  • If not finished or not tested, open as Draft

Review process

This 2-passes review process aims to:

• develop skills of junior reviewers
• limit the workload for senior reviewers
• limit the number of unnecessary changes by the author

1. The author creates a PR.
2. Review process:
   1. The author assigns the junior reviewer.
   2. The junior reviewer conducts their review:
      • Resolves their comments if they are addressed.
      • Adds comments if necessary or approves the PR.
   3. The junior reviewer assigns the senior reviewer.
   4. The senior reviewer conducts their review:
      • If there are no unresolved comments on the PR → merge.
      • Otherwise, we continue with 3.
3. The author responds to comments and/or makes corrections, and we go back to 2.

Notes:

1. The author can request a review at any time, even if the PR is still a Draft.
2. In theory, there should not be more than one reviewer at a time.
3. The author should not make any changes:
   • When a reviewer is assigned.
   • Between the junior and senior reviews.

[thomas-dkmt]

1. Sign in to your [Google Workspace Admin Dashboard](https://admin.google.com).
2. Go to **Apps/Web and mobile apps**
3. Click **Add app** and select **Add custom SAML app**.
4. Give your app a name and optionally a description.
5. To see how the fields should be filled out, refer to the screenshots below.

[cloudrootab]

1. Sign in to your [Google Workspace Admin Dashboard](https://admin.google.com).
2. Go to **Apps/Web and mobile apps**
3. Click **Add app** and select **Add custom SAML app**.
4. Give your app a name and optionally a description.
5. To see how the fields should be filled out, refer to the screenshots below.

The requested changes have been made.