Update index.md

Author: Aklakan

docs/sparql-extensions/index.md

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 # SPARQL Extensions
 RPT's SPARQL extensions are provided by our unofficial Jena eXtensions project called [JenaX](https://scaseco.github.io/jenax/).
 
-* The section [RDF/SPARQL Processing - Examples](examples/README.html) demonstrates both the usage of the `integrate` command as well as various SPARQL extenions.
+* The section [RDF/SPARQL Processing - Examples](../examples) demonstrates both the usage of the `integrate` command as well as various SPARQL extenions.
 * The extensions can be used standalone, such as with Jena Java projects, or as plugins for a Fuseki server. For more information, see the [JenaX ARQ Plugins documentation](https://scaseco.github.io/jenax/jenax-arq-parent/jenax-arq-plugins-parent/README.html).