installers: Rework session installer desc

* Also fix App Manager subtitle

Signed-off-by: Aayush Gupta <aayushgupta219@gmail.com>

app/src/main/assets/installers.json

@@ -3,7 +3,7 @@
     "id": "0",
     "title": "Session installer",
     "subtitle": "Session based installer for bundled/split APKs",
-    "description": "Best suited for devices running Android 5.0+",
+    "description": "Recommended, in-built and supports all Android versions",
     "url": "https://developer.android.com/reference/android/content/pm/PackageInstaller.Session"
   },
   {
@@ -15,7 +15,7 @@
   {
     "id": "4",
     "title": "AM Installer",
-    "subtitle": "Install use App Manager",
+    "subtitle": "Install using App Manager",
     "description": "You must have App Manager. Need adb/root mode to install when miui optimization is on."
   },
   {