Add note about one Vector property limitation.

Signed-off-by: Gerrit Meier <[email protected]>

Author: meistermeier

src/main/antora/modules/ROOT/pages/appendix/conversions.adoc

@@ -220,7 +220,9 @@ Spring Data has its own type for vector representation `org.springframework.data
 While this can be used as a wrapper around a `float` or `double` array, Spring Data Neo4j supports only the `double` variant right now.
 From a user perspective, it is possible to only define the `Vector` interface on the property definition and use either `double` or `float`.
 But on the database-side those values will be persisted as `doubles` for the time being to support manual persisted arrays and
-values persisted throug `setNodeVectorProperty`.
+values persisted through `setNodeVectorProperty`.
+
+NOTE: Spring Data Neo4j only allows one `Vector` property to be present in an entity definition.
 
 NOTE: Please be aware that a persisted `float` value differs from a read back value due to the nature of floating numbers.