Correct note in developer setup about building SSHD

We actually use our own Maven repository for it.

Signed-off-by: Shawn O. Pearce <sop@google.com>

Documentation/dev-readme.txt

diff --git a/Documentation/dev-readme.txt b/Documentation/dev-readme.txt
index 1816403..c7c4312 100644
--- a/Documentation/dev-readme.txt
+++ b/Documentation/dev-readme.txt
@@ -13,9 +13,6 @@
   repo init -u git://android.git.kernel.org/tools/manifest.git
 ====
 
-Also, you'll need to download and install Apache SSHD from source
-(execute `mvn install` in the top level of the source folder).
-
 Important Links
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