use diff in changelog

Signed-off-by: Christopher Diaz <cdiaz@rvohealth.com>

.changeset/lovely-impalas-sell.md

@@ -2,15 +2,15 @@
 '@backstage/plugin-search-backend-module-explore': patch
 ---
 
-Allows for an optional token manager to authenticate requests from the collator to the explore backend. For example:
+Allows for an optional `tokenManager` to authenticate requests from the collator to the explore backend. For example:
 
-```
+```diff
   indexBuilder.addCollator({
     schedule: every10MinutesSchedule,
     factory: ToolDocumentCollatorFactory.fromConfig(env.config, {
       discovery: env.discovery,
       logger: env.logger,
-      tokenManager: env.tokenManager,
+    + tokenManager: env.tokenManager,
     }),
   });
-```
+```