docs: update docs icons (#12465)

### What problem does this PR solve?

Update icons for docs.
Trailing spaces are auto truncated by the editor, does not affect real
content.

### Type of change

- [x] Documentation Update

docs/guides/agent/agent_component_reference/http.md

@@ -1,11 +1,14 @@
 ---
 sidebar_position: 30
 slug: /http_request_component
+sidebar_custom_props: {
+  categoryIcon: RagHTTP
+}
 ---
 
 # HTTP request component
 
-A component that calls remote services. 
+A component that calls remote services.
 
 ---