Merge pull request #1145 from Vimal-Raghubir/590-Add-missing-option

Add: Add missing option

docs/reference/commandline/dockerd.md

@@ -1432,11 +1432,12 @@ The list of currently supported options that can be reconfigured is this:
   specified at container creation. It defaults to "default" which is
   the runtime shipped with the official docker packages.
 - `runtimes`: it updates the list of available OCI runtimes that can
-  be used to run containers
+  be used to run containers.
 - `authorization-plugin`: specifies the authorization plugins to use.
 - `allow-nondistributable-artifacts`: Replaces the set of registries to which the daemon will push nondistributable artifacts with a new set of registries.
 - `insecure-registries`: it replaces the daemon insecure registries with a new set of insecure registries. If some existing insecure registries in daemon's configuration are not in newly reloaded insecure resgitries, these existing ones will be removed from daemon's config.
 - `registry-mirrors`: it replaces the daemon registry mirrors with a new set of registry mirrors. If some existing registry mirrors in daemon's configuration are not in newly reloaded registry mirrors, these existing ones will be removed from daemon's config.
+- `shutdown-timeout`: it replaces the daemon's existing configuration timeout with a new timeout for shutting down all containers.
 
 Updating and reloading the cluster configurations such as `--cluster-store`,
 `--cluster-advertise` and `--cluster-store-opts` will take effect only if