Fix inconsistent capitalization in oracle.mdx field references

[Copilot]

Addresses feedback from PR #344 regarding inconsistent capitalization in field name references.

Changes

• Normalized "Email or username" → "email or username" in two locations (lines 57, 71)
• Aligns with lowercase convention used in other LMS guides (e.g., cornerstone uses "username or user id")

Modified Files

• connection-guides/lms/oracle.mdx: Updated SSO Configuration section and Customer Responsibility list

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.

---

Summary by cubic

Updated the Oracle LMS guide to use lowercase “email or username” in SSO field references. This aligns terminology with other LMS guides and reduces confusion.

^{Written for commit 3f779fc. Summary will update automatically on new commits.}