Update CONTRIBUTING-DOCUMENTATION.adoc

CONTRIBUTING-DOCUMENTATION.adoc

 = How to contribute to the reference
 
-The Spring reference now uses http://asciidoctor.org/[asciidoctor]. This document describes how to contribute documentation updates to the Spring reference.
+The Spring Framework reference now uses http://asciidoctor.org/[asciidoctor]. This document describes how to contribute documentation updates to the Spring Framework reference.
 
 == Building with Gradle
 
@@ -25,4 +25,4 @@ Some notes on documentation
 * It is important to keep whitespaces to a minimum to make it simple to edit files. This means use an editor with line wrapping rather than manually inserting hard returns.
 * http://asciidoctor.org/docs/asciidoc-syntax-quick-reference/[Asciidoctor Quick Reference]
 * http://asciidoctor.org/docs/user-manual/[Asciidoctor Manual]
-* http://asciidoctor.org/docs/asciidoc-writers-guide/[Asciidoctor Writers Guide]
\ No newline at end of file
+* http://asciidoctor.org/docs/asciidoc-writers-guide/[Asciidoctor Writers Guide]