There are small typos in:
- docs/source/releases/v0.5.rst
- docs/source/releases/v3.2.rst
- src/oscar/apps/offer/queryset.py
- tests/integration/basket/test_models.py

Fixes:
- Should read `threshold` rather than `treshold`.
- Should read `overridden` rather than `overidden`.
- Should read `category` rather than `catagory`.
- Should read `applications` rather than `appliations`.

Signed-off-by: Tim Gates <tim.gates@iress.com>

Signed-off-by: Tim Gates <tim.gates@iress.com>