Bug: Incorrect weekday in The Org Manual [9.3 (release_9.3 @ /usr/share/emacs/27.1/lisp/org/)]

[Johnson]

I'm contributing to an org file python parser to correctly parse 
repeating timestamps, and uses the samples in The Org Manual as test cases.

I came across a minor typo in Section 8.3.2 Repeated tasks: 
https://orgmode.org/manual/Repeated-tasks.html

The sample has a date on 2019/04/05, and says it is Sunday:

```
** TODO Wash my hands
   DEADLINE: <2019-04-05 08:00 Sun .+1h>
   Marking this DONE shifts the date to exactly one hour from now.
```

But 2019/04/05 is in fact Friday:

```
** TODO Wash my hands
   DEADLINE: <2019-04-05 Fri 08:00 .+1h>
   Marking this DONE shifts the date to exactly one hour from now.
```

--
Sincerely,
Johnson