Change the display title of medical_specialism
Change the display title of medical_specialism

We got it wrong in the previous commit
(78110ee1915f9c221b068ed0e873b7c8f79ec8c5) it should be specialty, not
speciality.  Specialty is the medical term and medicine is the domain for
this finder, so that's the word we should use.

alphagov/specialist-publisher-rebuild,alphagov/specialist-publisher,alphagov/specialist-publisher-rebuild,alphagov/specialist-publisher,alphagov/specialist-publisher-rebuild,alphagov/specialist-publisher,alphagov/specialist-publisher-rebuild