Fix issues find during the demo

[balhar-jakub]

Describe your pull request here:

• Provide correct URLs with service id in case of Routing
• Provide correct URL parameters for registry endpoint.

List the file(s) included in this PR: api-mediation-routing.md, api-mediation-multi-tenancy.md

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

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[github-actions[bot]]

:smiley_cat: 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)
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• [ ] 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.
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