Update file locations for MCPE platforms

Updates for https://help.mojang.com/customer/portal/articles/1480874-where-are-minecraft-files-stored- folder locations for MCPE are below. Also, perhaps delineate the page a bit better with a section for each edition and subsections for each platform as follows:

• Minecraft (PC Java Edition)
  • Microsoft Windows
  • Apple OS X
  • Linux
• Minecraft: Pocket Edition
  • Android
  • Microsoft Windows 10
  • Microsoft Windows Phone
  • Apple iOS
  • Amazon Fire OS

File folder locations for MCPE:

Android & Amazon Fire OS
/sdcard/games/com.mojang/

Microsoft Windows 10 & Windows Phone
C:\Users(your pc username)\AppData\Local\Packages\Microsoft.MinecraftUWP_8wekyb3d8bbwe\LocalState\games\com.mojang\

Apple iOS
Apps/com.mojang.minecraftpe/Documents/games/com.mojang/