docs: NDK overview, remove x86 instruction set mention (b/6044027)

Change-Id: I37ee68fb78f2ed5edc1c34ff7198340b1ab5c49b

Author: joefernandez

docs/html/sdk/ndk/overview.jd

@@ -46,7 +46,7 @@ page.title=What is the NDK?
     <li>Documentation, samples, and tutorials</li>
   </ul>
 
-  <p>The latest release of the NDK supports these ARM instruction sets:</p>
+  <p>The latest release of the NDK supports the following instruction sets:</p>
 
   <ul>
     <li>ARMv5TE (including Thumb-1 instructions)</li>