fix memory stats display document

Signed-off-by: Sun Jianbo <wonderflow@zju.edu.cn>

docs/man/docker-stats.1.md

@@ -23,6 +23,6 @@ Run **docker stats** with multiple containers.
 
     $ docker stats redis1 redis2
     CONTAINER           CPU %               MEM USAGE/LIMIT     MEM %               NET I/O
-    redis1              0.07%               796 KiB/64 MiB      1.21%               788 B/648 B
+    redis1              0.07%               796 KB/64 MB        1.21%               788 B/648 B
     redis2              0.07%               2.746 MB/64 MB      4.29%               1.266 KB/648 B
 

docs/sources/reference/commandline/cli.md

@@ -2343,7 +2343,7 @@ Running `docker stats` on multiple containers
 
     $ docker stats redis1 redis2
     CONTAINER           CPU %               MEM USAGE/LIMIT     MEM %               NET I/O
-    redis1              0.07%               796 KiB/64 MiB      1.21%               788 B/648 B
+    redis1              0.07%               796 KB/64 MB        1.21%               788 B/648 B
     redis2              0.07%               2.746 MB/64 MB      4.29%               1.266 KB/648 B