Fix a grammaro.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@99917 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Archive/ArchiveWriter.cpp b/lib/Archive/ArchiveWriter.cpp
index 58fbbf4..a02601a 100644
--- a/lib/Archive/ArchiveWriter.cpp
+++ b/lib/Archive/ArchiveWriter.cpp
@@ -220,7 +220,7 @@
   }
 
   // Now that we have the data in memory, update the
-  // symbol table if its a bitcode file.
+  // symbol table if it's a bitcode file.
   if (CreateSymbolTable && member.isBitcode()) {
     std::vector<std::string> symbols;
     std::string FullMemberName = archPath.str() + "(" + member.getPath().str()