Update service_create.md

Typo in word propagation.

Signed-off-by: Jose Escobar <joseescobar@JE-MBP15-2017.local>

docs/reference/commandline/service_create.md

@@ -425,7 +425,7 @@ The following options can only be used for bind mounts (`type=bind`):
 
 Bind propagation refers to whether or not mounts created within a given
 bind mount or named volume can be propagated to replicas of that mount. Consider
-a mount point `/mnt`, which is also mounted on `/tmp`. The propation settings
+a mount point `/mnt`, which is also mounted on `/tmp`. The propagation settings
 control whether a mount on `/tmp/a` would also be available on `/mnt/a`. Each
 propagation setting has a recursive counterpoint. In the case of recursion,
 consider that `/tmp/a` is also mounted as `/foo`. The propagation settings