Update paths in libc++ build instructions. Patch from Jonathan Anderson.

llvm-svn: 255561
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 08ce75b6c653c8af6b4c43b91ee6aa61b61d1222
diff --git a/docs/BuildingLibcxx.rst b/docs/BuildingLibcxx.rst
index a7366c5..f00ce4f 100644
--- a/docs/BuildingLibcxx.rst
+++ b/docs/BuildingLibcxx.rst
@@ -23,14 +23,14 @@
 #. Checkout libc++:
 
    * ``cd where-you-want-llvm-to-live``
-   * ``cd llvm/tools``
+   * ``cd llvm/projects``
    * ``svn co http://llvm.org/svn/llvm-project/libcxx/trunk libcxx``
 
 #. Checkout libc++abi:
 
    * ``cd where-you-want-llvm-to-live``
    * ``cd llvm/projects``
-   * ``svn co http://llvm.org/svn/llvm-project/libc++abi libc++abi``
+   * ``svn co http://llvm.org/svn/llvm-project/libcxxabi/trunk libcxxabi``
 
 #. Configure and build libc++ with libc++abi: