docs: fix angular background fetching indicators replace rules (#9819)

docs(angular): add missing replace rules for background-fetching-indicators

- Add replace rules to convert React terminology to Angular equivalents
- Fixes useIsFetching -> injectIsFetching conversion in prose text
- Adds hook -> function terminology conversion
- Includes package name conversion for @tanstack/react-query
- Resolves Issue #9744

Author: Varunchandrashekar05

docs/framework/angular/guides/background-fetching-indicators.md

@@ -2,6 +2,12 @@
 id: background-fetching-indicators
 title: Background Fetching Indicators
 ref: docs/framework/react/guides/background-fetching-indicators.md
+replace:
+  {
+    'useIsFetching': 'injectIsFetching',
+    'hook': 'function',
+    '@tanstack/react-query': '@tanstack/angular-query-experimental'
+  }
 ---
 
 [//]: # 'Example'