update docs with make

Signed-off-by: Abhilash Gnan <abhilashgnan@gmail.com>

docs/helm/helm_list.md

@@ -49,6 +49,7 @@ helm list [flags] [FILTER]
   -h, --help                  help for list
   -m, --max int               maximum number of releases to fetch (default 256)
       --namespace string      show releases within a specific namespace
+  -n, --namespace-name        sort by release's namespace name
   -o, --offset string         next release name in the list, used to offset from start value
       --output string         output the specified format (json or yaml)
       --pending               show pending releases
@@ -78,4 +79,4 @@ helm list [flags] [FILTER]
 
 * [helm](helm.md)	 - The Helm package manager for Kubernetes.
 
-###### Auto generated by spf13/cobra on 1-Sep-2018
+###### Auto generated by spf13/cobra on 9-May-2019