journalctl: add -W as short for --no-hostname

--no-hostname is one of the switches I use very often. In particular,
when looking at CI logs, the hostname is almost never interesting.
-H is not yet used in journalctl, because journal operates locally, but
will want it if display of remote journals is implemented. Use -W.

shell-completion/bash/journalctl

@@ -47,7 +47,7 @@ _journalctl() {
                       --show-cursor --dmesg -k --pager-end -e -r --reverse
                       --utc -x --catalog --no-full --force --dump-catalog
                       --flush --rotate --sync --relinquish-var
-                      --smart-relinquish-var --no-hostname -N --fields
+                      --smart-relinquish-var --no-hostname -W -N --fields
                       --list-namespaces --list-invocations -I -v --verbose'
         [ARG]='-b --boot -D --directory -i --file -F --field -t --identifier
                       -T --exclude-identifier --facility -M --machine -o --output

shell-completion/zsh/_journalctl

@@ -99,7 +99,7 @@ _arguments -s \
     '(- *)'{-h,--help}'[Show this help]' \
     '(- *)--version[Show package version]' \
     '--no-pager[Do not pipe output into a pager]' \
-    --no-hostname"[Don't show the hostname of log messages]" \
+    '(-W --no-hostname)'{-W,--no-hostname}"[Don't show the hostname of log messages]" \
     '(-l --full)'{-l,--full}'[Show long fields in full]' \
     '(-a --all)'{-a,--all}'[Show all fields, including long and unprintable]' \
     '(-f --follow)'{-f,--follow}'[Follow journal]' \