update doc for MAC OS X to use the required Java version

Gerrit installation doc says required java version is 1.7, making
this doc consistant with the installation doc.

Change-Id: I82ae0177c0fb779cb5ef858e22f30e39f755c819

Documentation/dev-readme.txt

diff --git a/Documentation/dev-readme.txt b/Documentation/dev-readme.txt
index 2b0cda8..83d8f1a 100644
--- a/Documentation/dev-readme.txt
+++ b/Documentation/dev-readme.txt
@@ -52,13 +52,15 @@
 
 == Mac OS X
 
-On Mac OS X ensure "Java For Mac OS X 10.5 Upate 4" (or later) has
-been installed, and that `JAVA_HOME` is set to
-"/System/Library/Frameworks/JavaVM.framework/Versions/1.6/Home".
-Check the installed version by running `java -version` and looking
-for 'build 1.6.0_13-b03-211'.  Versions of Java 6 prior to this
-version crash during the build due to a bug in the JIT compiler.
+On Mac OS X ensure "Java For Mac OS X 10.5 Update 4" (or later) has
+been installed, and that `JAVA_HOME` is set to the
+link:install.html#Requirements[required Java version].
 
+Java installations can typically be found in
+"/System/Library/Frameworks/JavaVM.framework/Versions".
+
+You can check the installed Java version by running `java -version` in
+the terminal.
 
 [[init]]
 == Site Initialization