[DOC-12609]: Document the extension to vector syntax to support pre filtering: MB-62230 (#285)

* [DOC-12609]: Document the extension to vector syntax to support pre filtering: MB-62230

* [DOC-12609]: Document the extension to vector syntax to support pre filtering: MB-62230

Fleshing out the text following review.
Tidied up the advantages list.

* [DOC-12609]: Document the extension to vector syntax to support pre-filtering: MB-62230

Fixups following review.

Author: RayOffiah

modules/vector-search/pages/pre-filtering-vector-search.adoc

@@ -13,6 +13,13 @@ Pre-filtering allows you to execute vector searches over a subset of the vector
 via the means of a filter request that qualifies the subset.
 
 include::partial$vector-search-no-windows.adoc[]
+Using pre-filtering as part of your vector search offers two key advantages:
+
+. *Enhanced precision and relevance:*
+Narrow your search results based on specific criteria, such as organization, date/time ranges, or geospatial locations.
+
+. *Performance optimization:*
+Reduce the search space before executing queries to improve query execution time and reduce computational overhead.
 
 == Prerequisites