tweaks RoundingMode docstring and roundingmode logic

Author: chalmerlowe

google/cloud/bigquery/enums.py

@@ -364,16 +364,18 @@ class RoundingMode(enum.Enum):
     """Rounding mode options that can be used when storing NUMERIC or BIGNUMERIC
     values.
 
-    * Unspecified will default to using ROUND_HALF_AWAY_FROM_ZERO.
-    * ROUND_HALF_AWAY_FROM_ZERO rounds half values away from zero when applying
+    ROUNDING_MODE_UNSPECIFIED: will default to using ROUND_HALF_AWAY_FROM_ZERO.
+
+    ROUND_HALF_AWAY_FROM_ZERO: rounds half values away from zero when applying
     precision and scale upon writing of NUMERIC and BIGNUMERIC values.
-    For Scale:
-        0 1.1, 1.2, 1.3, 1.4 => 1
+    For Scale: 0
+        1.1, 1.2, 1.3, 1.4 => 1
         1.5, 1.6, 1.7, 1.8, 1.9 => 2
-    * ROUND_HALF_EVEN rounds half values to the nearest even value when applying
+
+    ROUND_HALF_EVEN: rounds half values to the nearest even value when applying
     precision and scale upon writing of NUMERIC and BIGNUMERIC values.
-    For Scale:
-        0 1.1, 1.2, 1.3, 1.4 => 1
+    For Scale: 0
+        1.1, 1.2, 1.3, 1.4 => 1
         1.5 => 2
         1.6, 1.7, 1.8, 1.9 => 2
         2.5 => 2

google/cloud/bigquery/schema.py

@@ -245,8 +245,8 @@ def __init__(
                 self._properties["roundingMode"] = rounding_mode.name
             elif isinstance(rounding_mode, str):
                 self._properties["roundingMode"] = rounding_mode
-            else:
-                self._properties["roundingMode"] = None
+        else:
+            self._properties["roundingMode"] = None
         if isinstance(foreign_type_definition, str):
             self._properties["foreignTypeDefinition"] = foreign_type_definition