Update TargetTriple format info.

Phabricator revision: http://reviews.llvm.org/D6543

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223473 91177308-0d34-0410-b5e6-96231b3b80d8

Author: Chad Rosier

include/llvm/IR/Module.h

@@ -219,6 +219,7 @@ class Module {
   Materializer;                   ///< Used to materialize GlobalValues
   std::string ModuleID;           ///< Human readable identifier for the module
   std::string TargetTriple;       ///< Platform target triple Module compiled on
+                                  ///< Format:<arch><sub>-<vendor>-<sys>-<abi>
   void *NamedMDSymTab;            ///< NamedMDNode names.
   // Allow lazy initialization in const method.
   mutable RandomNumberGenerator *RNG; ///< The random number generator for this module.