Typo fix EMACScript -> ECMAScript

Author: Peter Amstutz

v1.0/concepts.md

@@ -322,7 +322,7 @@ Expressions are denoted by the syntax `$(...)` or `${...}`.  A code
 fragment wrapped in the `$(...)` syntax must be evaluated as a
 [ECMAScript expression](http://www.ecma-international.org/ecma-262/5.1/#sec-11).  A
 code fragment wrapped in the `${...}` syntax must be evaluated as a
-[EMACScript function body](http://www.ecma-international.org/ecma-262/5.1/#sec-13)
+[ECMAScript function body](http://www.ecma-international.org/ecma-262/5.1/#sec-13)
 for an anonymous, zero-argument function.  Expressions must return a valid JSON
 data type: one of null, string, number, boolean, array, object. Other return
 values must result in a `permanentFailure`. Implementations must permit any

v1.1.0-dev1/concepts.md

@@ -323,7 +323,7 @@ Expressions are denoted by the syntax `$(...)` or `${...}`.  A code
 fragment wrapped in the `$(...)` syntax must be evaluated as a
 [ECMAScript expression](http://www.ecma-international.org/ecma-262/5.1/#sec-11).  A
 code fragment wrapped in the `${...}` syntax must be evaluated as a
-[EMACScript function body](http://www.ecma-international.org/ecma-262/5.1/#sec-13)
+[ECMAScript function body](http://www.ecma-international.org/ecma-262/5.1/#sec-13)
 for an anonymous, zero-argument function.  Expressions must return a valid JSON
 data type: one of null, string, number, boolean, array, object. Other return
 values must result in a `permanentFailure`. Implementations must permit any