fix(docs): run `make docs` (#4924)

Signed-off-by: Matthew Fisher <matt.fisher@microsoft.com>

docs/helm/helm_repo_update.md

@@ -20,6 +20,7 @@ helm repo update [flags]
 
 ```
   -h, --help     help for update
+      --strict   fail on update warnings
 ```
 
 ### Options inherited from parent commands
@@ -38,4 +39,4 @@ helm repo update [flags]
 
 * [helm repo](helm_repo.md)	 - add, list, remove, update, and index chart repositories
 
-###### Auto generated by spf13/cobra on 1-Aug-2018
+###### Auto generated by spf13/cobra on 15-Nov-2018