Fix man and commandline docs

- missing help option in `docs/reference/commandline/*.md` (some files
  have it, the other I fixed didn't)
- missing `[OPTIONS]` in Usage description
- missing options
- formatting
- start/stop idempotence

Signed-off-by: Antonio Murdaca <amurdaca@redhat.com>

docs/reference/commandline/pause.md

@@ -11,10 +11,12 @@ weight=1
 
 # pause
 
-    Usage: docker pause CONTAINER [CONTAINER...]
+    Usage: docker pause [OPTIONS] CONTAINER [CONTAINER...]
 
     Pause all processes within a container
 
+      --help=false    Print usage
+
 The `docker pause` command uses the cgroups freezer to suspend all processes in
 a container. Traditionally, when suspending a process the `SIGSTOP` signal is
 used, which is observable by the process being suspended. With the cgroups freezer