I can see how you can think "ample" is a typo on the "apple" website, but I know it's a real word.
Dictionary.com said:amâ‹…ple
  /ˈæmpəl/ Show Spelled Pronunciation [am-puhl] Show IPA
Use ample in a Sentence
–adjective, -pler, -plest.
1. fully sufficient or more than adequate for the purpose or needs; plentiful; enough: an ample supply of water; ample time to finish.
2. of sufficient or abundant measure; liberal; copious: an ample reward.
3. of adequate or more than adequate extent, size, or amount; large; spacious; roomy: ample storage space.