Fixed typo in django/db/backends/base/schema.py comment.

Signed-off-by: JaeHyuck Sa <wogur981208@gmail.com>

Author: JaeHyuckSa

django/db/backends/base/schema.py

@@ -938,7 +938,7 @@ def alter_field(self, model, old_field, new_field, strict=False):
 
     def _field_db_check(self, field, field_db_params):
         # Always check constraints with the same mocked column name to avoid
-        # recreating constrains when the column is renamed.
+        # recreating constraints when the column is renamed.
         check_constraints = self.connection.data_type_check_constraints
         data = field.db_type_parameters(self.connection)
         data["column"] = "__column_name__"