doc: Update Android developer documentation for NDK 14
doc: Update Android developer documentation for NDK 14

NDK 14 is current. Update the developer documentation to reflect this.

Recommend using subdirectories of out/ as the Android build output
directory, so that they’ll be ignored by .gitignore.

Bug: crashpad:30
Change-Id: Id1508215b924a3e0cae2c11a61c9c685363c50f6
Reviewed-on: https://chromium-review.googlesource.com/454202
Reviewed-by: Mark Mentovai <f1b5a91d4d6ad523f2610114591c007e75d15084@chromium.org>
Commit-Queue: Mark Mentovai <f1b5a91d4d6ad523f2610114591c007e75d15084@chromium.org>

atom/crashpad,chromium/crashpad,atom/crashpad,chromium/crashpad,atom/crashpad,chromium/crashpad