Fix typos of "function".

pkg/expect/lib/expect.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * This library contains an Expect class with static methods that can be used
  * for simple unit-tests.
  */
 library expect;
 
@@ skipping 345 matching lines @@
    *
    *     Expect.throws(myThrowingFunction, (e) => e is MyException);
    */
   static void throws(void f(),
                      [_CheckExceptionFn check = null,
                       String reason = null]) {
     String msg = reason == null ? "" : "($reason)";
     if (f is! _Nullary) {
       // Only throws from executing the funtion body should count as throwing.
       // The failure to even call `f` should throw outside the try/catch.
-      _fail("Expect.throws$msg: Funciton f not callable with zero arguments");
+      _fail("Expect.throws$msg: Function f not callable with zero arguments");
     }
     try {
       f();
     } catch (e, s) {
       if (check != null) {
         if (!check(e)) {
           _fail("Expect.throws$msg: Unexpected '$e'\n$s");
         }
       }
       return;
@@ skipping 22 matching lines @@
 
 /// Annotation class for testing of dart2js. Use this as metadata on method
 /// declarations to disable inlining of the annotated method.
 class NoInline {
   const NoInline();
 }
 
 /// Annotation class for testing of dart2js. Use this as metadata on method
 /// declarations to make the type inferrer trust the parameter and return types,
 /// effectively asserting the runtime values will (at least) be subtypes of the
-/// annotated types. 
+/// annotated types.
 ///
-/// While the actually inferred type is guaranteed to be a subtype of the 
-/// annotation, it often is more precise. In particular, if a method is only 
+/// While the actually inferred type is guaranteed to be a subtype of the
+/// annotation, it often is more precise. In particular, if a method is only
 /// called with `null`, the inferrer will still infer null. To ensure that
-/// the annotated type is also the inferred type, additionally use 
+/// the annotated type is also the inferred type, additionally use
 /// [AssumeDynamic].
 class TrustTypeAnnotations {
   const TrustTypeAnnotations();
 }
 
 /// Annotation class for testing of dart2js. Use this as metadata on method
 /// declarations to disable closed world assumptions on parameters, effectively
 /// assuming that the runtime arguments could be any value. Note that the
-/// constraints due to [TrustTypeAnnotations] still apply. 
+/// constraints due to [TrustTypeAnnotations] still apply.
 class AssumeDynamic {
   const AssumeDynamic();
 }