update: password-hash key limitations

[nick-gagliardi]

Description

Adds two pieces of information to the export password hashes and MFA secrets doc around public key size and character limit guidance.

References

Testing

Checklist

• I've read and followed CONTRIBUTING.md.
• I've tested the site build for this change locally.
• I've made appropriate docs updates for any code or config changes.
• I've coordinated with the Product Docs and/or Docs Management team about non-trivial changes.

[github-actions]

Summary

Status	Count
🔍 Total	10
✅ Successful	5
⏳ Timeouts	0
🔀 Redirected	0
👻 Excluded	4
❓ Unknown	0
🚫 Errors	1
⛔ Unsupported	0

Errors per input

Errors in main/docs/manage-users/user-migration/export-password-hashes-and-mfa-secrets.mdx

• [302] https://support.auth0.com/ | Rejected status code (this depends on your "accept" configuration): Found
  Full Github Actions output

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