Fixed typo and made warning a little clearer

Signed-off-by: Mark Stickley <markstickley@theyakshack.co.uk>

.changeset/khaki-pandas-nail.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-catalog-backend': patch
+---
+
+Fixed a typo and made a little clarification to a warning message

plugins/catalog-backend/src/processing/ProcessorOutputCollector.ts

@@ -62,7 +62,7 @@ export class ProcessorOutputCollector {
   private receive(i: CatalogProcessorResult) {
     if (this.done) {
       this.logger.warn(
-        `Item if type ${i.type} was emitted after processing had completed at ${
+        `Item of type "${i.type}" was emitted after processing had completed. Stack trace: ${
           new Error().stack
         }`,
       );