chore: update llm.py (#5335)

api/core/model_runtime/model_providers/vertex_ai/llm/llm.py

@@ -99,7 +99,7 @@ class VertexAiLargeLanguageModel(LargeLanguageModel):
             credentials.refresh(request)
             token = credentials.token
 
-        # Vertex AI Anthropic Claude3 Opus model avaiable in us-east5 region, Sonnet and Haiku avaiable in us-central1 region
+        # Vertex AI Anthropic Claude3 Opus model available in us-east5 region, Sonnet and Haiku available in us-central1 region
         if 'opus' in model:
             location = 'us-east5'
         else: