Spelling fixes e to i.

runtime/vm/ast_transformer.cc

Index: runtime/vm/ast_transformer.cc
diff --git a/runtime/vm/ast_transformer.cc b/runtime/vm/ast_transformer.cc
index d21ef31e26dafffa79edb2925079af9d759daf74..7ce398c8652eee9fe7a4f187342df9617b46c67a 100644
--- a/runtime/vm/ast_transformer.cc
+++ b/runtime/vm/ast_transformer.cc
@@ -233,8 +233,8 @@ void AwaitTransformer::VisitAwaitNode(AwaitNode* node) {
 }
 
 
-// Transforms boolean expressions into a sequence of evaluatons that only lazily
-// evaluate subexpressions.
+// Transforms boolean expressions into a sequence of evaluations that only
+// lazily evaluate subexpressions.
 //
 // Example:
 //
@@ -281,7 +281,7 @@ LocalScope* AwaitTransformer::ChainNewScope(LocalScope* parent) {
 void AwaitTransformer::VisitBinaryOpNode(BinaryOpNode* node) {
   AstNode* new_left = Transform(node->left());
   AstNode* new_right = NULL;
-  // Preserve lazy evaluaton.
+  // Preserve lazy evaluation.
   if ((node->kind() == Token::kAND) || (node->kind() == Token::kOR)) {
     new_right = LazyTransform(node->kind(), new_left, node->right());
   } else {