README: Remove MMS annotation for experimental features

8 jobs for wip/mms_enable in 15 minutes and 20 seconds
Status Name Job ID Coverage
  Build
passed build-pureos-gcc-byzantium #376526
librem5

00:03:09

 
  Test
passed check-po #376528
librem5

00:00:17

passed test:debian-gcc #376527
librem5

00:03:27

20.6%
 
  Package
passed package-pureos-byzantium #376529
librem5

00:01:53

passed package-pureos-byzantium:arm64 #376533
librem5:arm64

00:05:39

canceled package-pureos-byzantium:arm64 #376530
librem5:arm64

 
  Test Package
passed autopkgtest-pureos-byzantium-package #376531
librem5

00:01:10

passed lintian-pureos-byzantium-package #376532
librem5

00:00:51