Fix doc filename instead of title shown in nav menu
MODIFY
docs/modules/guides/pages/use-prerelease-version.adoc
docs/modules/guides/pages/use-prerelease-version.adoc
-== Using a pre-release version
+= Using a pre-release version
Pre-release versions of `AsciidoctorJ` are published to oss.sonatype.org.
The exact location of the repository will be announced.

Fix doc filename instead of title shown in nav menu