Fix to_json Memory Tests (pandas-dev#28259)

Author: WillAyd

asv_bench/benchmarks/io/json.py

@@ -118,15 +118,15 @@ def setup(self, orient, frame):
     def time_to_json(self, orient, frame):
         getattr(self, frame).to_json(self.fname, orient=orient)
 
-    def mem_to_json(self, orient, frame):
+    def peakmem_to_json(self, orient, frame):
         getattr(self, frame).to_json(self.fname, orient=orient)
 
     def time_to_json_wide(self, orient, frame):
         base_df = getattr(self, frame).copy()
         df = concat([base_df.iloc[:100]] * 1000, ignore_index=True, axis=1)
         df.to_json(self.fname, orient=orient)
 
-    def mem_to_json_wide(self, orient, frame):
+    def peakmem_to_json_wide(self, orient, frame):
         base_df = getattr(self, frame).copy()
         df = concat([base_df.iloc[:100]] * 1000, ignore_index=True, axis=1)
         df.to_json(self.fname, orient=orient)