add docs for `docker load --quiet`

Signed-off-by: Harald Albers <github@albersweb.de>

docs/reference/commandline/load.md

@@ -16,6 +16,7 @@ parent = "smn_cli"
 
       --help             Print usage
       -i, --input=""     Read from a tar archive file, instead of STDIN. The tarball may be compressed with gzip, bzip, or xz
+      -q, --quiet        Suppress the load output. Without this option, a progress bar is displayed.
 
 Loads a tarred repository from a file or the standard input stream.
 Restores both images and tags.

man/docker-load.1.md

@@ -8,7 +8,7 @@ docker-load - Load an image from a tar archive or STDIN
 **docker load**
 [**--help**]
 [**-i**|**--input**[=*INPUT*]]
-
+[**-q**|**--quiet**]
 
 # DESCRIPTION
 
@@ -22,6 +22,9 @@ Restores both images and tags.
 **-i**, **--input**=""
    Read from a tar archive file, instead of STDIN. The tarball may be compressed with gzip, bzip, or xz.
 
+**-q**, **--quiet**
+   Suppress the load output. Without this option, a progress bar is displayed.
+
 # EXAMPLES
 
     $ docker images