DATAMONGO-1015 - Fixed link to Spring Data Commons reference docs.

src/main/asciidoc/index.adoc

@@ -1,7 +1,7 @@
 = Spring Data MongoDB - Reference Documentation
 Mark Pollack, Thomas Risberg, Oliver Gierke, Costin Leau, Jon Brisbin, Thomas Darimont, Christoph Strobl
 :toc:
-:spring-data-commons-docs: https://raw.githubusercontent.com/spring-projects/spring-data-commons/issue/DATACMNS-551/src/main/asciidoc
+:spring-data-commons-docs: https://raw.githubusercontent.com/spring-projects/spring-data-commons/master/src/main/asciidoc
 {version}
 
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