Update LMS SAP Guide with Platform Token Server Auth Refinements

[mstrivens]

Updates Authentication Flow 3 in the LMS SAP SuccessFactors guide with the following refinements:

Changes

• Added note that Platform Token Server auth is write-only
• Included Learning Content Provider step in the authentication flow
• Changed "Connecting with StackOne" to "Connecting Your Account"
• Maintained all existing steps including Learning Server URL retrieval

Closes #365

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Summary by cubic

Added a complete write-only Platform Token Server authentication flow to the SAP SuccessFactors LMS guide and clarified the inputs needed to link accounts. This enables teams to configure OAuth2 with X.509 to write data safely.

• New Features
  • Documented Authentication Flow 3 with steps to find the API Server, Learning Domain URL, Username, Company ID, register the OAuth2 client, generate the X.509 certificate, download the private key, and locate the API Key.
  • Added the Learning Content Provider requirement to the connection steps.
  • Renamed the linking section to “Connecting Your Account,” kept the Flows 1 & 2 linking section, and noted initial auth may take up to 15 minutes (401 until ready).

^{Written for commit e9dca84. Summary will update on new commits.}

[Copilot]

Pull request overview

This PR adds a new Authentication Flow 3 to the SAP SuccessFactors connection guide, documenting Platform Token Server Authentication for write-only operations. The update provides comprehensive instructions for OAuth2 authentication using X.509 certificates.

Changes:

• Added Authentication Flow 3 for Platform Token Server Authentication with write-only capabilities
• Included step-by-step instructions for certificate generation, API key retrieval, and Learning Content Provider configuration
• Updated the account linking section heading to differentiate between Flow 3 and Flows 1 & 2

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