docs: remove shim_no_newns in ops.md

Ace-Tang · Ace-Tang · commit 2d03791158ad · 2019-06-26T16:37:36.000+08:00
this ops is removed in commit fd2e3cd, remove from doc avoid misleading users. Signed-off-by: Ace-Tang <aceapril@126.com>
diff --git a/docs/ops.md b/docs/ops.md
@@ -216,9 +216,6 @@ The linux runtime allows a few options to be set to configure the shim and the r
 	no_shim = false
 	# display shim logs in the containerd daemon's log output
 	shim_debug = true
-	# do not put the shim in its own mount namespace
-	# (this only need to be set on kernel < 3.18)
-	shim_no_newns = true
 ```
 
 ### Bolt Metadata Plugin
