ARTEMIS-5938 Fixing typo

Author: clebertsuconic

docs/user-manual/index.adoc

@@ -148,4 +148,4 @@ image::images/artemis_text_black_small.png[align="center"]
 * xref:configuration-index.adoc#configuration-reference[Configuration Index]
 * xref:examples.adoc#examples[Examples]
 * xref:versions.adoc#version-history[Version History]
-* xref:notice.adoc#legal-notice[Notice]
+* xref:notice.adoc#legal-notice[Legal Notice]