[scene_manager] Cleanup out of date scene_manager moniker selector

- src/ui/lib/input_pipeline/docs/stages/inspect_handler.md: updated the moniker selector
- src/diagnostics/config/fire/components.json5: add the new moniker selector and keep the old seletor for later cleanup

Bug: 103300
Change-Id: I2cfd3c2dd5d5a08b2a737b7b555116bc940bf8ae
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/693812
Reviewed-by: Chris Phoenix <cphoenix@google.com>
Fuchsia-Auto-Submit: Jianpeng Chao <chaopeng@google.com>
Reviewed-by: Filip Filmar <fmil@google.com>
Commit-Queue: Auto-Submit <auto-submit@fuchsia-infra.iam.gserviceaccount.com>
diff --git a/src/diagnostics/config/fire/components.json5 b/src/diagnostics/config/fire/components.json5
index d51390a..d41d5c6 100644
--- a/src/diagnostics/config/fire/components.json5
+++ b/src/diagnostics/config/fire/components.json5
@@ -554,4 +554,9 @@
         label: "Text Manager CFv2",
         moniker: "core/text_manager",
     },
+    {
+        id: 215,
+        label: "Scene Manager",
+        moniker: "core/ui/scene_manager",
+    },
 ]
diff --git a/src/ui/lib/input_pipeline/docs/stages/inspect_handler.md b/src/ui/lib/input_pipeline/docs/stages/inspect_handler.md
index 31f94f1..4f02b2e 100644
--- a/src/ui/lib/input_pipeline/docs/stages/inspect_handler.md
+++ b/src/ui/lib/input_pipeline/docs/stages/inspect_handler.md
@@ -6,14 +6,13 @@
 To see the recorded metrics use a command line such as this one:
 
 ```
-fx ffx inspect show \
-    "core/session-manager/session:\:session/scene_manager"
+fx ffx inspect show "core/ui/scene_manager"
 ```
 
 The output will be like this:
 
 ```
-core/session-manager/session\:session/scene_manager:
+core/ui/scene_manager:
   metadata:
     filename = fuchsia.inspect.Tree
     component_url = fuchsia-pkg://fuchsia.com/scene_manager#meta/scene_manager.cm