[2.0.x] Updated typing error

[djangocontributors]

1. boundfield.py
   132 line, contents -> 'contents' (Ambiguity override)

2. forms.py
   65 line, by -> from

3. forms.py
   389 line, data -> the data

4. formsets.py
   106 line, return -> Return

5. formsets.py
   114 line, inlines -> in-lines

6. formsets.py
   297 line, on -> of

7. django/django/db/utils.py
   136 line,
   Requires additional annotation information as to whether 'database' is used as a variable.
   If not variable, suggest upper case.

8. session.py
   13 line & 14line, on -> onto

9. session.py
   20 line, make -> makes / made

10. lookups.py
    76 line, null -> None

11. lookups.py
    55 line, 'search' word need big quotation mark

[carltongibson]

Assuming this is an error. @djangocontributors If you can let me know what you're trying to do here perhaps I can help.