Update arena_elo/generation_model_info.json

arena_elo/generation_model_info.json

@@ -4,7 +4,7 @@
         "License": "MIT License",
         "Organization": "Tsinghua University"
     },
-    "Playground V2": {
+    "PlayGround V2": {
         "Link": "https://huggingface.co/playgroundai/playground-v2-1024px-aesthetic",
         "License": "Playground v2 Community License",
         "Organization": "Playground"