DOC: Enforce Numpy Docstring Validation for pandas.DatetimeTZDtype.unit (pandas-dev#58387)

* DOC: add SA01 to DatetimeTZDtype.tz

* DOC: remove SA01 of DatetimeTZDtype.unit

Author: tuhinsharma121

ci/code_checks.sh

@@ -116,7 +116,6 @@ if [[ -z "$CHECK" || "$CHECK" == "docstrings" ]]; then
         -i "pandas.DatetimeIndex.tz_convert RT03" \
         -i "pandas.DatetimeTZDtype SA01" \
         -i "pandas.DatetimeTZDtype.tz SA01" \
-        -i "pandas.DatetimeTZDtype.unit SA01" \
         -i "pandas.Grouper PR02" \
         -i "pandas.Index PR07" \
         -i "pandas.Index.T SA01" \

pandas/core/dtypes/dtypes.py

@@ -793,6 +793,10 @@ def unit(self) -> str_type:
         """
         The precision of the datetime data.
 
+        See Also
+        --------
+        DatetimeTZDtype.tz : Retrieves the timezone.
+
         Examples
         --------
         >>> from zoneinfo import ZoneInfo