Fixed how to build link in create new extension guide
= Create a new extension
:page-aliases: create-new-extension.adoc
-1. You should know xref:contributor-guide/index.adoc#how-to-build[how to build].
+1. You should know xref:index.adoc#how-to-build[how to build].
2. Go through the https://quarkus.io/guides/extension-authors-guide[Quarkus extension author's guide] to get an idea of
what is expected from you.
