DOC: point out the limitation of precision while doing serialization (#54100)

point out the limitation of precision while doing serialization

Author: natmokval

pandas/core/generic.py

@@ -2417,7 +2417,8 @@ def to_json(
             the default is 'epoch'.
         double_precision : int, default 10
             The number of decimal places to use when encoding
-            floating point values.
+            floating point values. The possible maximal value is 15.
+            Passing double_precision greater than 15 will raise a ValueError.
         force_ascii : bool, default True
             Force encoded string to be ASCII.
         date_unit : str, default 'ms' (milliseconds)