Update work-with-params-secrets.md

Update note about using environment variables in lightweight monitors to wrap with quotes to ensure proper replacement.

Author: mmahacek

solutions/observability/synthetics/work-with-params-secrets.md

@@ -84,7 +84,7 @@ You can use params in both lightweight and browser monitors created in either a
 
 ### In a Synthetics project [synthetics-params-secrets-use-project]
 
-For lightweight monitors in a Synthetics project, wrap the name of the param in `${}` (for example, `${my_url}`).
+For lightweight monitors in a Synthetics project, wrap the name of the param in `"${}"` (for example, `"${my_url}"`). 
 
 ```yaml
 - type: http
@@ -147,4 +147,4 @@ export default {
     my_url: process.env.MY_URL
   }
 };
-```
+```