docs: fix yearly recurrence format and clarify sort/limitations

- Fix `REM Mon DD` → `REM MMM DD` in yearly recurrence table
- Clarify `--sort original` preserves processing order in CLI reference
- Update `RELATED=END` trigger behaviour (treated as `RELATED=START`)
- Remove unsupported EXDATE/RDATE+override limitation (now handled)
- Fix `--sort none` → `--sort original` in CLI help text
- Remove EXDATE/RDATE/override guard from `simple_recurrence`

bin/commandLine.ml

@@ -43,7 +43,7 @@ type sort_order = Asc | Desc | Original
 let sort_order_enum = [ ("asc", Asc); ("desc", Desc); ("original", Original) ]
 
 let sort =
-  let doc = "Output sort order by date: $(b,desc) (default), $(b,asc), or $(b,none) (file order)." in
+  let doc = "Output sort order by date: $(b,desc) (default), $(b,asc), or $(b,original) (processing order)." in
   Arg.(value & opt (enum sort_order_enum) Desc & info [ "sort" ] ~docv:"ORDER" ~doc)
 
 let source =