mention deviceready in plugin docs

for a in cordova-plugin-*; do test -f $a/doc/index.md && grep -l deviceready $a/doc/index.md || (grep -L deviceready $a/doc/index.md |sed -e 's/^/no deviceready in: /'; grep -lr decideready $a/*); done 2>/dev/null |sort
cordova-plugin-battery-status/doc/index.md
cordova-plugin-device/doc/index.md
cordova-plugin-network-information/doc/index.md
cordova-plugin-splashscreen/doc/index.md
no deviceready in: cordova-plugin-camera/doc/index.md
no deviceready in: cordova-plugin-console/doc/index.md
no deviceready in: cordova-plugin-contacts/doc/index.md
no deviceready in: cordova-plugin-device-motion/doc/index.md
no deviceready in: cordova-plugin-device-orientation/doc/index.md
no deviceready in: cordova-plugin-dialogs/doc/index.md
no deviceready in: cordova-plugin-file-transfer/doc/index.md
no deviceready in: cordova-plugin-file/doc/index.md
no deviceready in: cordova-plugin-geolocation/doc/index.md
no deviceready in: cordova-plugin-globalization/doc/index.md
no deviceready in: cordova-plugin-inappbrowser/doc/index.md
no deviceready in: cordova-plugin-media-capture/doc/index.md
no deviceready in: cordova-plugin-media/doc/index.md
no deviceready in: cordova-plugin-statusbar/doc/index.md
no deviceready in: cordova-plugin-vibration/doc/index.md