docs: fix "buidler" typos in Typeface.Builder am: 8aeade4629 am: f36f2de31a

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/9975934

Change-Id: I7593fd1af6e5e310322ffba85d6140f6e71b4cb5