RDK: Fix README typo

 Replace 'rdkgerritprod' with 'rdkgerrithub'

Change-Id: I37ae40f65df220e253cc78e5e9a217902ff17211
diff --git a/README.rdk.md b/README.rdk.md
index 433197c..d76494a 100644
--- a/README.rdk.md
+++ b/README.rdk.md
@@ -12,7 +12,7 @@
 If your machine login isn't the same as your comcast ntid, add this to your
 ~/.ssh/config:
 ```
-Host rdkgerritprod.stb.r53.xcal.tv
+Host rdkgerrithub.stb.r53.xcal.tv
 User <youruser>
 IdentityFile ~/.ssh/<yourkey> #optional, if you want to specify a specific private key
 ```