Fix vector header (#999)

Author: JPryce-Aklundh

modules/ROOT/pages/indexes/semantic-indexes/vector-indexes.adoc

@@ -431,8 +431,8 @@ Returns the requested number of approximate nearest neighbor relationships and t
 
 |===
 
-[limitations-and-issues]
-== Limitiations and known issues
+[[limitations-and-issues]]
+== Limitations and known issues
 
 As of Neo4j 5.13, the vector index is no longer a beta feature.
 It does, however, still contain some limitations and known issues.