docs: add See Also for description of pause and unpause

make them reference to each other.

Signed-off-by: Chen Hanxiao <chenhanxiao@cn.fujitsu.com>

docs/man/docker-pause.1.md

@@ -23,5 +23,8 @@ further details.
 # OPTIONS
 There are no available options.
 
+# See also
+**docker-unpause(1)** to unpause all processes within a container.
+
 # HISTORY
 June 2014, updated by Sven Dowideit <SvenDowideit@home.org.au>

docs/man/docker-unpause.1.md

@@ -20,5 +20,8 @@ further details.
 # OPTIONS
 There are no available options.
 
+# See also
+**docker-pause(1)** to pause all processes within a container.
+
 # HISTORY
 June 2014, updated by Sven Dowideit <SvenDowideit@home.org.au>