[ticket/12054] Update index_body_linklist_before/after template events

PHPBB3-12054
[ticket/12054] Reword descriptions and resort events alphabetically

PHPBB3-12054
[ticket/12054] Re-word event documentation

PHPBB3-12054
Merge remote-tracking branch 'vsephpbb/ticket/12054' into develop

* vsephpbb/ticket/12054:
  [ticket/12054] Re-word event documentation
  [ticket/12054] Reword descriptions and resort events alphabetically
  [ticket/12054] Update index_body_linklist_before/after template events