org: add missing :exports results :results silent

* doc/org/ltlfilt.org, doc/org/tut30.org, doc/org/tut31.org: Hide rm
invocations used for cleanup.
29 jobs for next in 335 minutes and 34 seconds (queued for 3 seconds)
Status Name Job ID Coverage
  Build
passed alpine-gcc #138476

00:53:06

passed arch-clang #138502

00:53:29

passed arch-gcc-glibcxxdebug #138480

01:14:13

passed debian-gcc-snapshot #138478

01:11:14

passed debian-stable-gcc #138380

01:07:22

passed debian-unstable-gcc-coverage #138381

00:35:11

90.7%
passed debpkg-stable #138503

01:21:08

passed debpkg-unstable #138504

01:15:55

passed mingw-shared #138475

00:11:44

passed mingw-static #138387

00:10:45

passed raspbian #138391
armv7

01:32:00

passed rpm-pkg #138505

01:06:13

failed alpine-gcc #138383

00:00:25

failed arch-clang #138479

00:00:25

failed arch-clang #138384

00:00:26

failed arch-gcc-glibcxxdebug #138385

00:00:39

failed debian-gcc-snapshot #138382
allowed to fail

00:00:23

failed debpkg-stable #138481

00:00:38

failed debpkg-stable #138388

00:00:39

failed debpkg-unstable #138482

00:00:26

failed debpkg-unstable #138389

00:00:26

failed mingw-shared #138386

00:00:25

failed rpm-pkg #138492

00:00:30

failed rpm-pkg #138477

00:00:26

failed rpm-pkg #138390

00:01:49

 
  Build2
passed debpkg-stable-i386 #138392
x86

01:12:12

passed debpkg-unstable-i386 #138393
x86

00:57:50

 
  Publish
passed publish-rpm #138394
dput

00:00:29

passed publish-unstable #138395
dput

00:01:33