docs(compile/selmulti): description for compile/selmulti error

Closes angular#3459

Author: mhevery

docs/content/error/compile/selmulti.ngdoc

@@ -2,3 +2,19 @@
 @name $compile:selmulti
 @fullName Binding to Multiple Attribute
 @description
+
+Binding to the `multiple` attribute of `select` element is not supported since switching between multiple and single mode changes the {@link api/ng.directive:ngModel `ngModel`} object type from instance to array of instances which breaks the model semantics.
+
+If you need to use different types of `select` elements in your template based on some variable, please use {@link api/ng.directive:ngIf ngIf} or {@link api/ng.directive:ngSwitch ngSwitch} directives to select one of them to be used at runtime.
+
+
+Example with invalid usage:
+```
+<select ng-model="some.model" multiple="{{mode}}"></select>
+```
+
+Example that uses ngIf to pick one of the `select` elements based on a variable:
+```
+<select ng-if="mode == 'multiple'" ng-model="some.model" multiple></select>
+<select ng-if="mode != 'multiple'" ng-model="some.model"></select>
+```

src/ng/compile.js

@@ -1291,7 +1291,7 @@ function $CompileProvider($provide) {
 
 
       if (name === "multiple" && nodeName_(node) === "SELECT") {
-        throw $compileMinErr("selmulti", "Binding to the multiple attribute is not supported. Element: {0}",
+        throw $compileMinErr("selmulti", "Binding to the 'multiple' attribute is not supported. Element: {0}",
             startingTag(node));
       }
 

test/ng/directive/booleanAttrsSpec.js

@@ -93,7 +93,7 @@ describe('boolean attr directives', function() {
 
       expect(function() {
         $compile('<select multiple="{{isMultiple}}"></select>')
-      }).toThrow('[$compile:selmulti] Binding to the multiple attribute is not supported. ' +
+      }).toThrow('[$compile:selmulti] Binding to the \'multiple\' attribute is not supported. ' +
                  'Element: <select multiple="{{isMultiple}}">');
 
     }));