[docgen] Update doc/orgmode.txt

skip-checks: true

Author: github-actions

doc/orgmode.txt

@@ -503,6 +503,11 @@ Example:
 Journal example:
   `{ j = { description = 'Journal', template = '\n*** %<%Y-%m-%d> %<%A>\n**** %U\n\n%?', target = '~/sync/org/journal.org' } }`
 
+Nested key example:
+  `{ e =  'Event' }`
+  `{ er = { description = 'recurring', template = '** %?\n %T', target = '~/org/calendar.org', headline = 'recurring' } }`
+  `{ eo = { description = 'one-time', template = '** %?\n %T', target = '~/org/calendar.org', headline = 'one-time' } }`
+
 ORG_AGENDA_MIN_HEIGHT                              *orgmode-org_agenda_min_height*
 
 type: `number`