review comments

Author: surbhigarg92

google/cloud/spanner_v1/client.py

@@ -260,7 +260,6 @@ def __init__(
             raise TypeError(
                 "default_transaction_options must be an instance of DefaultTransactionOptions"
             )
-
         self._default_transaction_options = default_transaction_options
 
     @property

google/cloud/spanner_v1/database.py

@@ -900,7 +900,7 @@ def run_in_transaction(self, func, *args, **kw):
                    from being recorded in change streams with the DDL option `allow_txn_exclusion=true`.
                    This does not exclude the transaction from being recorded in the change streams with
                    the DDL option `allow_txn_exclusion` being false or unset.
-                   "isolation_level" sets the isolation level for transaction.
+                   "isolation_level" sets the isolation level for the transaction.
 
         :rtype: Any
         :returns: The return value of ``func``.

google/cloud/spanner_v1/session.py

@@ -452,7 +452,7 @@ def run_in_transaction(self, func, *args, **kw):
                    from being recorded in change streams with the DDL option `allow_txn_exclusion=true`.
                    This does not exclude the transaction from being recorded in the change streams with
                    the DDL option `allow_txn_exclusion` being false or unset.
-                   "isolation_level" sets the isolation level for transaction.
+                   "isolation_level" sets the isolation level for the transaction.
 
         :rtype: Any
         :returns: The return value of ``func``.