Update z/OSMF service ID property format

[Martin-Zeithaml]

Describe your pull request here:
Typo in example

List the file(s) included in this PR:
docs/user-guide/authentication-providers-for-apiml.md

After creating the PR, follow the instructions in the comments.

[github-actions]

😺 Thank you for creating this PR! To publish your content to Zowe Docs, follow these required steps.

• Add the label review: doc.
• Identify your content topic with a label. (Examples: area: apiml, area: cli, area: install and config, etc.)
• Specify the major Zowe release(s) for your content. (Examples: release: V1, release: V2, release: V3)
  • If adding content that needs to be removed from V3 documentation, add the V3 N/A tag.
• Select the master branch if your PR updates content that is on the live site. Select docs-staging if your PR updates content for a future release.
• Notify the Doc Squad about this PR. If you don't know whom should review your content, message the #zowe-doc Slack channel. If you know which Doc Squad writer should approve your content, add that person as a reviewer.

Need help? Contact the Doc Squad in the #zowe-doc Slack channel.

[github-actions]

🚀 Deployed on https://69b96d8884ff113fa46c18dd--zowe-docs-master.netlify.app