Documentation: fixed release description

doc/release/0.3.0.org

@@ -35,12 +35,11 @@ The release identifier [[http://www.behindthename.com/name/chares][chares]]
 is derived from the Greek word Χαρης (Chares) and χαρις (Charis) and means "grace, kindness".
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 This is the third official release of the CASM project.
-It introduces four three improvements.
+It introduces three improvements.
 First, we improved our AST language implementation to provide a lossless syntax tree representation.
 Build on this implementation feature we are able to construct a source formatting beautifier application called =casmf=.
 This application function in the near future as the official CASM formatting application.