Merge pull request #283238 from mrbullwinkle/mrb_08_01_2024_usage_tier

[Azure OpenAI] Add usage tier info for mini

Author: prmerger-automator[bot]

articles/ai-services/openai/quotas-limits.md

@@ -89,7 +89,8 @@ The Usage Limit determines the level of usage above which customers might see la
 
 |Model| Usage Tiers per month |
 |----|----|
-|`GPT-4o` |1.5 Billion tokens |
+|`gpt-4o` |1.5 Billion tokens |
+|`gpt-4o-mini` | 45 Billion tokens |
 
 ## Other offer types