Merge pull request #7815 from mrbullwinkle/mrb_10_23_2025_rapi_fix

[Azure OpenAI] [Responses API] region availability fix

Author: prmerger-automator[bot]

articles/ai-foundry/openai/how-to/responses.md

@@ -32,7 +32,6 @@ The responses API is currently available in the following regions:
 - brazilsouth
 - canadacentral
 - canadaeast  
-- centralus
 - eastus
 - eastus2
 - francecentral