Update pyFAI notebook with detector geometry helper function

Update the azimuthal integration notebook with the extra-geom helper function for the detector generation.

Closes #52 (closed)

doc/changelog.rst

@@ -12,6 +12,8 @@ unreleased
     - fix :issue:`64` regarding loading a subset of trains :mr:`226`, :mr:`230`
     - fix :issue:`67` regarding bunch pattern :mr:`245`
     - fix :issue:`44` regarding notebook for DSSC geometry quadrants alignment :mr:`247`
+    - fix :issue:`52` use extra-geom detector helper function for azimuthal integration :mr:`248`
+
 
 - **Improvements**