[Binding] Replace 'Unscopeable' with 'Unscopable'

third_party/WebKit/Source/bindings/IDLExtendedAttributes.md

 # Blink IDL Extended Attributes
 
 [TOC]
 
 ## Introduction
 
 The main interest in extended attributes are their _semantics_: Blink implements many more extended attributes than the Web IDL standard, to specify various behavior.
 
 The authoritative list of allowed extended attributes and values is [bindings/IDLExtendedAttributes.txt](https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit/Source/bindings/IDLExtendedAttributes.txt). This is complete but not necessarily precise (there may be unused extended attributes or values), since validation is run on build, but coverage isn't checked.
 
@@ skipping 460 matching lines @@
 [Unforgeable] attribute DOMString str;
 [Unforgeable] interface XXX { ... };
 ```
 
 By default, interface members are configurable (i.e. you can modify a property descriptor corresponding to the member and also you can delete the property). `[Unforgeable]` makes the member unconfiguable so that you cannot modify or delete the property corresponding to the member.
 
 `[Unconfiguable]` changes where the member is defined, too. By default, attribute getters/setters and methods are defined on a prototype chain. `[Unforgeable]` defines the member on the instance object instead of the prototype object.
 
 Implementation: **Non-standard**: `[Unforgeable]` for attributes has an unspeced side-effect that it makes the property data-type property (`{writable: ..., value: ...}`) although it must be accessor-type property (`{get: ..., set: ...}`). ([Bug 497616](https://crbug.co/497616))
 
-### [Unscopeable] _(o, a)_
+### [Unscopable] _(o, a)_
 
-Standard: [Unscopeable](http://heycam.github.io/webidl/#Unscopeable)
+Standard: [Unscopable](http://heycam.github.io/webidl/#Unscopable)
 
 Summary: The interface member will not appear as a named property within `with` statements.
 
 Usage: Can be specified on attributes or interfaces.
 
 ## Common Blink-specific IDL Extended Attributes
 
 These extended attributes are widely used.
 
 ### [ActiveScriptWrappable] _(i)_
@@ skipping 1095 matching lines @@
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