update comment

vectordb_bench/backend/clients/pgvector/cli.py

@@ -21,7 +21,7 @@
 def set_default_quantized_fetch_limit(ctx, param, value):
     if ctx.params.get("reranking") and value is None:
         # ef_search is the default value for quantized_fetch_limit as it's bound by ef_search.
-        # 100 (arbitrary) is default value for quantized_fetch_limit for IVFFlat.
+        # 100 is default value for quantized_fetch_limit for IVFFlat.
         default_value = ctx.params["ef_search"] if ctx.command.name == "pgvectorhnsw" else 100
         return default_value
     return value