Update lld documentation to mention PDB support.

Differential Revision: https://reviews.llvm.org/D43636

llvm-svn: 325821
diff --git a/lld/docs/windows_support.rst b/lld/docs/windows_support.rst
index 6b06d29..780c663 100644
--- a/lld/docs/windows_support.rst
+++ b/lld/docs/windows_support.rst
@@ -56,9 +56,8 @@
   ``EXPORTS``, ``HEAPSIZE``, ``STACKSIZE``, ``NAME``, and ``VERSION``.
 
 Debug info
-  :none:`No progress has been made`. Microsoft linker can interpret the CodeGen
-  debug info (old-style debug info) and PDB to emit an .pdb file. LLD doesn't
-  support neither.
+  :good:`Done`.  LLD can emit PDBs that are at parity with those generated by
+  link.exe.  However, LLD does not support /DEBUG:FASTLINK.
 
 
 Building LLD