Dart SDK Spelling b, c, and d.

pkg/compiler/lib/src/resolution/semantic_visitor.dart

Index: pkg/compiler/lib/src/resolution/semantic_visitor.dart
diff --git a/pkg/compiler/lib/src/resolution/semantic_visitor.dart b/pkg/compiler/lib/src/resolution/semantic_visitor.dart
index 304b852637d1254433cf78f5c974f375abffa56e..211bd07d022a44622229bb5363cf10a840797fa1 100644
--- a/pkg/compiler/lib/src/resolution/semantic_visitor.dart
+++ b/pkg/compiler/lib/src/resolution/semantic_visitor.dart
@@ -330,7 +330,7 @@ abstract class SemanticSendVisitor<R, A> {
   R visitDynamicPropertyInvoke(
       Send node, Node receiver, NodeList arguments, Selector selector, A arg);
 
-  /// Conditinal invocation of the property defined by [selector] on [receiver]
+  /// Conditional invocation of the property defined by [selector] on [receiver]
   /// with [arguments], if [receiver] is not null.
   ///
   /// For instance:
@@ -2201,7 +2201,7 @@ abstract class SemanticSendVisitor<R, A> {
   R errorInvalidSetIfNull(Send node, ErroneousElement error, Node rhs, A arg);
 
   /// If-null assignment expression of [rhs] to the class type literal
-  /// [contant]. That is, [rhs] is only evaluated and assigned, if the value
+  /// [constant]. That is, [rhs] is only evaluated and assigned, if the value
   /// is of the [constant] is `null`. The behavior is thus equivalent to a type
   /// literal access.
   ///