DOC: fix RT03 for pandas.date_range (#59868)

Author: tuhinsharma121

ci/code_checks.sh

@@ -170,7 +170,6 @@ if [[ -z "$CHECK" || "$CHECK" == "docstrings" ]]; then
         -i "pandas.core.resample.Resampler.sum SA01" \
         -i "pandas.core.resample.Resampler.transform PR01,RT03,SA01" \
         -i "pandas.core.resample.Resampler.var SA01" \
-        -i "pandas.date_range RT03" \
         -i "pandas.errors.AttributeConflictWarning SA01" \
         -i "pandas.errors.CSSWarning SA01" \
         -i "pandas.errors.CategoricalConversionWarning SA01" \

pandas/core/indexes/datetimes.py

@@ -875,6 +875,7 @@ def date_range(
     Returns
     -------
     DatetimeIndex
+        A DatetimeIndex object of the generated dates.
 
     See Also
     --------