android/*: fix command descriptions (#5807)

pages/android/dumpsys.md

@@ -1,6 +1,7 @@
 # dumpsys
 
 > Provide information about Android system services.
+> This command can only be used through `adb shell`.
 > More information: <https://developer.android.com/studio/command-line/dumpsys>.
 
 - Get diagnostic output for all system services:

pages/android/getprop.md

@@ -1,9 +1,9 @@
 # getprop
 
-> Show information about adb devices and emulators.
+> Show information about Android system properties.
 > More information: <https://manned.org/getprop>.
 
-- Display information about the Android system properties:
+- Display information about Android system properties:
 
 `getprop`
 

pages/android/input.md

@@ -1,7 +1,7 @@
 # input
 
 > Send event codes or touchscreen gestures to an Android device.
-> Event codes can be inputting single characters, ending calls, volume up, etc.
+> This command can only be used through `adb shell`.
 > More information: <https://developer.android.com/reference/android/view/KeyEvent.html#constants_1>.
 
 - Send an event code for a single character to an Android device:

pages/android/logcat.md

@@ -1,7 +1,6 @@
 # logcat
 
 > Dump a log of system messages.
-> Native Android CLI tool.
 > More information: <https://developer.android.com/studio/command-line/logcat>.
 
 - Display system logs:

pages/android/wm.md

@@ -1,6 +1,7 @@
 # wm
 
 > Show information about the screen of an Android device.
+> This command can only be used through `adb shell`.
 
 - Display the physical size of an Android device's screen: