Add missing comma in get_mountpoints() docstring

Author: CarstenGrohmann

testinfra/modules/mountpoint.py

@@ -84,7 +84,7 @@ def get_mountpoints(cls):
         """Returns a list of MountPoint instances
 
         >>> host.mount_point.get_mountpoints()
-        [<MountPoint(path=/proc, device=proc, filesystem=proc, options=rw,nosuid,nodev,noexec,relatime)>
+        [<MountPoint(path=/proc, device=proc, filesystem=proc, options=rw,nosuid,nodev,noexec,relatime)>,
          <MountPoint(path=/, device=/dev/sda1, filesystem=ext4, options=rw,relatime,errors=remount-ro,data=ordered)>]
         """  # noqa
         mountpoints = []