Remove obsolete note about libatomic.

There's only one GCC in any given NDK release, and it always has
libatomic.

Change-Id: Ifbdc10961c711a6ce27eab60ca2751a04a358a13
diff --git a/docs/html/ndk/guides/cpp-support.jd b/docs/html/ndk/guides/cpp-support.jd
index b340ead..173af28 100644
--- a/docs/html/ndk/guides/cpp-support.jd
+++ b/docs/html/ndk/guides/cpp-support.jd
@@ -186,7 +186,7 @@
 LIBCXX_FORCE_REBUILD := true
 </pre>
 
-<h4>atomic support</h4>
+<h4>Atomic support</h4>
 
 <p>If you include {@code &lt;atomic&gt;}, it's likely that you also need {@code libatomic}.
 If you are using {@code ndk-build}, add the following line:</p>
@@ -201,10 +201,6 @@
 -latomic
 </pre>
 
-<p class="note"><strong>Note: </strong>{@code -latomic} is only available for GCC 4.8.
-Because Clang 3.5 and Clang 3.6 use GCC 4.8's headers and libraries, as well as its
-{@code as} and {@code ld} options, those versions of Clang also get {@code -latomic}.</p>
-
 
 <h4>Compatibility</h4>