remove warning about NDK (circleci#2537)

NDK actually *is* installed on some of the more recent images (e.g.
api-28-alpha)

Author: smart-alek

jekyll/_cci2/language-android.md

@@ -110,8 +110,6 @@ For convenience, CircleCI provides a set of Docker images for building Android a
 
 The CircleCI Android image is based on the [`openjdk:8-jdk`](https://hub.docker.com/_/openjdk/) official Docker image, which is based on [buildpack-deps](https://hub.docker.com/_/buildpack-deps/). The base OS is Debian Jessie, and builds run as the `circleci` user, which has full access to passwordless `sudo`.
 
-**Note:** The CircleCI Android image does *not* include the Android NDK. If you require that toolset, consider using another [existing image](https://hub.docker.com/search/?isAutomated=0&isOfficial=0&page=1&pullCount=0&q=android-ndk&starCount=0) or making your own image.
-
 ### API Levels
 
 We have a different Docker image for each [Android API level](https://source.android.com/source/build-numbers). To use API level 24 (Nougat 7.0) in a job, you should select `circleci/android:api-24-alpha`.