Update the documentation of spring property from `spring.ai.vectorstore.neo4j.dimensions` to `spring.ai.vectorstore.neo4j.embedding-dimension` to reflect what the code reads. Without this change, changes to the property `dimensions` are not propagated to runtime code, resulting in discrepancies if an embedding model that has a different number of dimensions is used Signed-off-by: Vinay Balamuru <balamuru@gmail.com>