fix: insert missing " in list-users documentation

[lupeterm]

Description

Fixes #934
A missing " in ListUsersRequestViewer.tsx led to a missing " in the documentation for list-users:

openfga.dev/src/components/Docs/SnippetViewer/ListUsersRequestViewer.tsx

Line 58 in c144f0b

"type: "${objectType}",

References

Review Checklist

• I have clicked on "allow edits by maintainers".
• I have added documentation for new/changed functionality in this PR or in a PR to openfga.dev [Provide a link to any relevant PRs in the references section above]
• The correct base branch is being used, if not main
• I have added tests to validate that the change in functionality is working as expected

[linux-foundation-easycla]

• ❌ - login: @lupeterm / name: Lukas Petermann . The commit (ec18e83) is not authorized under a signed CLA. Please click here to be authorized. For further assistance with EasyCLA, please submit a support request ticket.

[lupeterm]

As this is single-character fix - I was unsure about the necessity of Review Checklist marks 2&4.