Sample was not runnable

doc/development/telemetry/snowplow.md

@@ -393,7 +393,7 @@ Snowplow Micro is a Docker-based solution for testing frontend and backend event
 1. Send a test Snowplow event from the Rails console:
 
    ```ruby
-   Gitlab::Tracking.self_describing_event('iglu:com.gitlab/pageview_context/jsonschema/1-0-0', { page_type: ‘MY_TYPE' }, context: nil )
+   Gitlab::Tracking.self_describing_event('iglu:com.gitlab/pageview_context/jsonschema/1-0-0', { page_type: 'MY_TYPE' }, context: nil )
    ```
 
 ### Snowplow Mini