Error missing in the content-nav (#294)

Causing broken link.
It's also being addressed in the main branch using this PR
#293, so no need to
cherry-pick it.

Author: lidiazuin

modules/ROOT/content-nav.adoc

@@ -433,6 +433,7 @@
 **** xref:errors/gql-errors/52N24.adoc[]
 **** xref:errors/gql-errors/52N25.adoc[]
 **** xref:errors/gql-errors/52N26.adoc[]
+**** xref:errors/gql-errors/52N27.adoc[]
 **** xref:errors/gql-errors/52N28.adoc[]
 **** xref:errors/gql-errors/52N29.adoc[]
 **** xref:errors/gql-errors/52N30.adoc[]