Update URLS for git repositories.

Updating the references from the old git URL to the new gitbox one.

Reviewed at https://reviews.apache.org/r/68110/
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index daf95bc..76d4cef 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -2,7 +2,7 @@
 
 First things first, you'll need the source! The Aurora source is available from Apache git:
 
-    git clone https://git-wip-us.apache.org/repos/asf/aurora
+    git clone https://gitbox.apache.org/repos/asf/aurora
 
 Read the Style Guides
 ---------------------
diff --git a/docs/development/committers-guide.md b/docs/development/committers-guide.md
index 2650f19..aadf254 100644
--- a/docs/development/committers-guide.md
+++ b/docs/development/committers-guide.md
@@ -29,7 +29,7 @@
 
 2. Add your gpg key to the Apache Aurora KEYS file:
 
-               git clone https://git-wip-us.apache.org/repos/asf/aurora.git
+               git clone https://gitbox.apache.org/repos/asf/aurora
                (gpg --list-sigs <KEY ID> && gpg --armor --export <KEY ID>) >> KEYS
                git add KEYS && git commit -m "Adding gpg key for <APACHE ID>"
                ./rbt post -o -g
diff --git a/ui/package.json b/ui/package.json
index 567dd78..789ee85 100644
--- a/ui/package.json
+++ b/ui/package.json
@@ -60,7 +60,7 @@
   },
   "repository": {
     "type": "git",
-    "url": "https://git-wip-us.apache.org/repos/asf/aurora"
+    "url": "https://gitbox.apache.org/repos/asf/aurora"
   },
   "author": "",
   "license": "Apache-2.0"