DOC: remove SA01 for pandas.Timestamp.as_unit

Author: tuhinsharma121

ci/code_checks.sh

@@ -285,7 +285,6 @@ if [[ -z "$CHECK" || "$CHECK" == "docstrings" ]]; then
         -i "pandas.TimedeltaIndex.nanoseconds SA01" \
         -i "pandas.TimedeltaIndex.seconds SA01" \
         -i "pandas.TimedeltaIndex.to_pytimedelta RT03,SA01" \
-        -i "pandas.Timestamp.as_unit SA01" \
         -i "pandas.Timestamp.asm8 SA01" \
         -i "pandas.Timestamp.astimezone SA01" \
         -i "pandas.Timestamp.ceil SA01" \