Correct table formatting

The embedded pipes in the example `openssl` command for setting `cookie.cookieSecret` were causing the end of that command to overflow into the next column making the command incomplete/non-functional.

Author: gchappel

helm/oauth2-proxy/README.md

@@ -75,7 +75,7 @@ Parameter | Description | Default
 `authenticatedEmailsFile.annotations` | configmap or secret annotations | `nil`
 `config.clientID` | oauth client ID | `""`
 `config.clientSecret` | oauth client secret | `""`
-`config.cookieSecret` | server specific cookie for the secret; create a new one with `openssl rand -base64 32 | head -c 32 | base64` | `""`
+`config.cookieSecret` | server specific cookie for the secret; create a new one with `openssl rand -base64 32 \| head -c 32 \| base64` | `""`
 `config.existingSecret` | existing Kubernetes secret to use for OAuth2 credentials. See [secret template](https://github.com/oauth2-proxy/manifests/blob/master/helm/oauth2-proxy/templates/secret.yaml) for the required values | `nil`
 `config.configFile` | custom [oauth2_proxy.cfg](https://github.com/oauth2-proxy/oauth2-proxy/blob/master/contrib/oauth2-proxy.cfg.example) contents for settings not overridable via environment nor command line | `""`
 `config.existingConfig` | existing Kubernetes configmap to use for the configuration file. See [config template](https://github.com/oauth2-proxy/manifests/blob/master/helm/oauth2-proxy/templates/configmap.yaml) for the required values | `nil`