Fix URL to use Monorepo instead of SVN

Author: Yuanfang Chen

docs/quickstart.rst

@@ -27,7 +27,7 @@ following steps should suffice on any modern Unix variant:
 
 #. Checkout the LNT sources::
 
-            svn co http://llvm.org/svn/llvm-project/lnt/trunk ~/lnt
+            git clone https://github.com/llvm/llvm-lnt.git ~/lnt
 
 #. Install LNT into the virtual environment::
 
@@ -52,7 +52,7 @@ command. The information below should be enough to get you started, but see the
 
 #. Checkout the LLVM test-suite, if you haven't already::
 
-     svn co http://llvm.org/svn/llvm-project/test-suite/trunk ~/llvm-test-suite
+     git clone https://github.com/llvm/llvm-test-suite.git ~/llvm-test-suite
 
    You should always keep the test-suite directory itself clean (that is, never
    do a configure inside your test suite). Make sure not to check it out into