chore: Update README.md for missing backtick. (#450)

Author: alecnunn

charts/kubernetes-external-secrets/README.md

@@ -78,7 +78,7 @@ The following table lists the configurable parameters of the `kubernetes-externa
 | `env.METRICS_PORT`                        | Specify the port for the prometheus metrics server                                                                                | `3001`                                |
 | `env.ROLE_PERMITTED_ANNOTATION`           | Specify the annotation key where to lookup the role arn permission boundaries                                                     | `iam.amazonaws.com/permitted`         |
 | `env.POLLER_INTERVAL_MILLISECONDS`        | Set POLLER_INTERVAL_MILLISECONDS in Deployment Pod                                                                                | `10000`                               |
-| `env.VAULT_ADDR`                          | Endpoint for the Vault backend, if using Vault                                                                                    | `http://127.0.0.1:8200                |
+| `env.VAULT_ADDR`                          | Endpoint for the Vault backend, if using Vault                                                                                    | `http://127.0.0.1:8200`                |
 | `env.DISABLE_POLLING`                     | Disables backend polling and only updates secrets when ExternalSecret is modified, setting this to any value will disable polling | `nil`                                 |
 | `envVarsFromSecret.AWS_ACCESS_KEY_ID`     | Set AWS_ACCESS_KEY_ID (from a secret) in Deployment Pod                                                                           |                                       |
 | `envVarsFromSecret.AWS_SECRET_ACCESS_KEY` | Set AWS_SECRET_ACCESS_KEY (from a secret) in Deployment Pod                                                                       |                                       |