DOC Unsetting "copy_on_write" mode to remove EX02 errors (#51110)

DOC Correcting EX02 errors

Author: DeaMariaLeon

ci/code_checks.sh

@@ -578,13 +578,11 @@ if [[ -z "$CHECK" || "$CHECK" == "docstrings" ]]; then
 
     MSG='Partially validate docstrings (EX02)' ;  echo $MSG
     $BASE_DIR/scripts/validate_docstrings.py --format=actions --errors=EX02 --ignore_functions \
-        pandas.DataFrame.copy \
         pandas.DataFrame.plot.line \
         pandas.DataFrame.std \
         pandas.DataFrame.var \
         pandas.Index.factorize \
         pandas.Period.strftime \
-        pandas.Series.copy \
         pandas.Series.factorize \
         pandas.Series.floordiv \
         pandas.Series.plot.line \

pandas/errors/__init__.py

@@ -339,6 +339,7 @@ class ChainedAssignmentError(ValueError):
     >>> df = pd.DataFrame({'A': [1, 1, 1, 2, 2]}, columns=['A'])
     >>> df["A"][0:3] = 10 # doctest: +SKIP
     ... # ChainedAssignmentError: ...
+    >>> pd.options.mode.copy_on_write = False
     """