Document the llvm-upgrade tool.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32124 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/CommandGuide/index.html b/docs/CommandGuide/index.html
index 349da74..8ef0bf5 100644
--- a/docs/CommandGuide/index.html
+++ b/docs/CommandGuide/index.html
@@ -38,6 +38,9 @@
 <li><a href="html/llvm-dis.html"><b>llvm-dis</b></a> -
     disassemble a bytecode file into a human-readable .ll file</li>
 
+<li><a href="html/llvm-upgrade.html"><b>llvm-upgrade</b></a> -
+    upgrade LLVM assembly from previous version</li>
+
 <li><a href="html/opt.html"><b>opt</b></a> -
     run a series of LLVM-to-LLVM optimizations on a bytecode file</li>