Update helm-integration.md
`sed` command is missing input file argument
@@ -381,7 +381,7 @@ the filename.
```
cp ~/.helm/repository/repositories.yaml .
-sed -i -e 's/^\( *cache: \).*\/\(.*\.yaml\)/\1\2/g'
+sed -i -e 's/^\( *cache: \).*\/\(.*\.yaml\)/\1\2/g' repositories.yaml
```
Now you can create a secret in the same namespace as you're running
