add comments and fix a typo

Signed-off-by: Haoyang Li <[email protected]>

integration_tests/src/main/python/data_gen.py

@@ -245,6 +245,7 @@ def start(self, rand):
 class DecimalGen(DataGen):
     """Generate Decimals, with some built in corner cases."""
     def __init__(self, precision=None, scale=None, nullable=True, special_cases=None, avoid_positive_values=False, full_precision=False):
+        """full_precision: If True, generate decimals with full precision without leading and trailing zeros."""
         if precision is None:
             #Maximum number of decimal digits a Long can represent is 18
             precision = 18

integration_tests/src/main/python/date_time_test.py

@@ -574,7 +574,7 @@ def test_timestamp_seconds_long_overflow():
         conf={},
         error_message='long overflow')
 
-# Make sure every decimal value in test data is rounding necessary by set full_precision=True to
+# Make sure every decimal value in test data is 'Rounding necessary' by set full_precision=True to
 # avoid leading and trailing zeros
 @pytest.mark.xfail(condition = is_not_utc(), reason = 'xfail non-UTC time zone tests because of https://github.com/NVIDIA/spark-rapids/issues/9653')
 @pytest.mark.parametrize('data_gen', [DecimalGen(7, 7, full_precision=True), DecimalGen(20, 7, full_precision=True)], ids=idfn)