Central URL is not explicit enough

[cbordier]

Issue description

Currently, most of the page referencing Central URL are using the US one. But since we added multiple region EU/APAC, it is not clear what url should be used.

Problem location

• https://docs.axway.com/bundle/amplify-central/page/docs/integrate_with_central/platform-auth-examples/index.html
• https://docs.axway.com/bundle/amplify-central/page/docs/integrate_with_central/query-the-traceability-apis-with-lexus/index.html
• https://docs.axway.com/bundle/amplify-central/page/docs/integrate_with_central/cli_central/index.html -> need to mention the --region parameter

Suggestions for a fix

Add note to mention the url for each region

[cbordier]

Intregrated.