Fix a ton of comment typos found by codespell.  Patch by
Luis Felipe Strano Moraes!

llvm-svn: 129558
diff --git a/llvm/lib/Support/Unix/Program.inc b/llvm/lib/Support/Unix/Program.inc
index 6efc8cd..9f0a9ef 100644
--- a/llvm/lib/Support/Unix/Program.inc
+++ b/llvm/lib/Support/Unix/Program.inc
@@ -236,7 +236,7 @@
   // Create a child process.
   int child = fork();
   switch (child) {
-    // An error occured:  Return to the caller.
+    // An error occurred:  Return to the caller.
     case -1:
       MakeErrMsg(ErrMsg, "Couldn't fork");
       return false;