docs: replace stale 'android' name mentions with 'iris'

The plugin is named 'iris' (IrisAdapter, IRIS_HOME_CHANNEL, label Iris),
but several docs still referred to it as the android platform/plugin and
to the product as 'the Android app'. Rename name-mentions to iris/IRIS
and product-mentions to 'Iris app'; keep legitimate OS references
(androidApp, Android SDK, Android 10, androidx, test_android.py, ...).

Also includes pi-lens markdown-lint autofixes (table spacing, trailing
newlines) in the touched files.

docs/setup.md

@@ -56,7 +56,7 @@ hermes gateway               # or: hermes gateway restart after config changes
 > the LAN, re-run `hermes gateway setup` (or edit `~/.hermes/.env`) and set
 > `IRIS_WS_HOST` to the host's LAN IP (e.g. `192.168.1.10`).
 
-## 2. Android app
+## 2. Iris app (Android)
 
 Build and install (ADB device connected):