Splitting out the cli command into parts.

Signed-off-by: Mary Anthony <mary@docker.com>

docs/reference/commandline/unpause.md

@@ -0,0 +1,23 @@
+<!--[metadata]>
++++
+title = "unpause"
+description = "The unpause command description and usage"
+keywords = ["cgroups, suspend, container"]
+[menu.main]
+parent = "smn_cli"
+weight=1
++++
+<![end-metadata]-->
+
+# unpause
+
+    Usage: docker unpause CONTAINER [CONTAINER...]
+
+    Unpause all processes within a container
+
+The `docker unpause` command uses the cgroups freezer to un-suspend all
+processes in a container.
+
+See the
+[cgroups freezer documentation](https://www.kernel.org/doc/Documentation/cgroups/freezer-subsystem.txt)
+for further details.