docs: fix typo in session docs

[JadeFlute0127]

Description of Change

Handful of typo fixes.

Checklist

• PR description included and stakeholders cc'd
• npm test passes
• relevant documentation, tutorials, templates and examples are changed or added
  (https://github.com/electron/clerk/blob/main/README.md#examples).

Release Notes

Notes: none

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[release-clerk]

No Release Notes