Fix copypaste error 'is-automated'

Signed-off-by: Misty Stanley-Jones <misty@docker.com>
(cherry picked from commit 2333657e1b20d6a482627b78c9333cdf34397ff5)
Signed-off-by: Victor Vieux <victorvieux@gmail.com>

docs/reference/commandline/search.md

@@ -128,7 +128,7 @@ and are automated builds:
 This example displays images with a name containing 'busybox', at least
 3 stars and are official builds:
 
-    $ docker search --filter "is-automated=true" --filter "stars=3" busybox
+    $ docker search --filter "is-official=true" --filter "stars=3" busybox
     NAME                 DESCRIPTION                                     STARS     OFFICIAL   AUTOMATED
     progrium/busybox                                                     50                   [OK]
     radial/busyboxplus   Full-chain, Internet enabled, busybox made...   8                    [OK]