[spec] "version 2.0" -> "release 2.0" (WebAssembly#1452)

Author: rossberg

document/core/index.bs

@@ -9,7 +9,7 @@ ED: https://webassembly.github.io/spec/core/bikeshed/
 Editor: Andreas Rossberg (Dfinity Stiftung)
 Repository: WebAssembly/spec
 Markup Shorthands: css no, markdown no, algorithm no, idl no
-Abstract: This document describes version 2.0 of the core WebAssembly standard, a safe, portable, low-level code format designed for efficient execution and compact representation.
+Abstract: This document describes release 2.0 of the core WebAssembly standard, a safe, portable, low-level code format designed for efficient execution and compact representation.
 Prepare For TR: true
 </pre>