Unify docker commands' usage in man and help

Signed-off-by: Ma Shimiao <mashimiao.fnst@cn.fujitsu.com>

docs/reference/commandline/load.md

@@ -13,7 +13,7 @@ weight=1
 
     Usage: docker load [OPTIONS]
 
-    Load an image from a tar archive on STDIN
+    Load an image from a tar archive or STDIN
 
       -i, --input=""     Read from a tar archive file, instead of STDIN
 

man/docker-export.1.md

@@ -2,7 +2,7 @@
 % Docker Community
 % JUNE 2014
 # NAME
-docker-export - Export the contents of a filesystem as a tar archive to STDOUT
+docker-export - Export the contents of a container's filesystem as a tar archive
 
 # SYNOPSIS
 **docker export**

man/docker-load.1.md

@@ -2,7 +2,7 @@
 % Docker Community
 % JUNE 2014
 # NAME
-docker-load - Load an image from a tar archive on STDIN
+docker-load - Load an image from a tar archive or STDIN
 
 # SYNOPSIS
 **docker load**

man/docker-logout.1.md

@@ -2,7 +2,7 @@
 % Docker Community
 % JUNE 2014
 # NAME
-docker-logout - Log out from a Docker Registry.
+docker-logout - Log out from a Docker registry.
 
 # SYNOPSIS
 **docker logout**

man/docker-top.1.md

@@ -11,7 +11,7 @@ CONTAINER [ps OPTIONS]
 
 # DESCRIPTION
 
-Look up the running process of the container. ps-OPTION can be any of the
+Display the running process of the container. ps-OPTION can be any of the
  options you would pass to a Linux ps command.
 
 # OPTIONS
@@ -31,3 +31,4 @@ Run **docker top** with the ps option of -x:
 April 2014, Originally compiled by William Henry (whenry at redhat dot com)
 based on docker.com source material and internal work.
 June 2014, updated by Sven Dowideit <SvenDowideit@home.org.au>
+June 2015, updated by Ma Shimiao <mashimiao.fnst@cn.fujitsu.com>