These commands are bound respectively to 'P' and 'N', and navigate to
the first item of the previous or next group in the "*xref*" buffer.
+---
*** New alternative value for 'xref-show-definitions-function':
'xref-show-definitions-completing-read'.
+---
*** The two existing alternatives for 'xref-show-definitions-function'
have been renamed to have "proper" public names and documented
('xref-show-definitions-buffer' and