Merge branch 'mr/remove_members_cmd_docs' into 'master'

Add docs for ``mailman members --delete`` command

See merge request !547
10 jobs for master in 9 minutes and 19 seconds
Status Job ID Name Coverage
  Test
passed #279662861
docs

00:02:34

passed #279662867
mysql
mysql-35

00:08:41

passed #279662868
mysql
mysql-37

00:08:27

passed #279662865
postgres
pgsql-35

00:06:54

passed #279662866
postgres
pgsql-37

00:05:20

passed #279662860
qa

00:02:27

passed #279662862
sqlite-35

00:05:15

passed #279662863
sqlite-36

00:05:45

passed #279662864
sqlite-37

00:05:15

 
  Deploy
passed trigger-client