DOC: Update tutorial on error handling

Summary

The error handling has been updated in the tutorial (see #52 (closed)). Also, #49 (closed) has been fixed on the way.

Focus

src/doc/tutorials/erros.rst

Test Environment

make doc on top level and look at build/doc/html/tutorials/errors.html.

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examples/set_permissions.py

@@ -206,7 +206,8 @@ def create_test_entities():
     After calling this function, there will be a RecordType "Human Food" with the corresponding Records
     "Bread", "Tomatoes", and "Twinkies" inserted in the database.
     """
-    rt = db.RecordType(name="Human Food", description="Food that can be eaten only by humans").insert()
+    rt = db.RecordType(
+        name="Human Food", description="Food that can be eaten only by humans").insert()
     food = ("Bread", "Tomatoes", "Twinkies")
 
     cont = db.Container()