Document new SEARCH clause.

Author: Lojjs

modules/ROOT/content-nav.adoc

@@ -29,6 +29,7 @@
 ** xref:clauses/order-by.adoc[]
 ** xref:clauses/remove.adoc[]
 ** xref:clauses/return.adoc[]
+** xref:clauses/search.adoc[]
 ** xref:clauses/set.adoc[]
 ** xref:clauses/listing-functions.adoc[]
 ** xref:clauses/listing-procedures.adoc[]

modules/ROOT/pages/clauses/index.adoc

@@ -70,6 +70,9 @@ These comprise sub-clauses that must operate as part of reading clauses.
 m| xref::clauses/where.adoc[WHERE]
 | Adds constraints to the patterns in a `MATCH` or `OPTIONAL MATCH` clause or filters the results of a `WITH` clause.
 
+m| xref::clauses/search.adoc[SEARCH]
+| A sub-clause following `MATCH` or `OPTIONAL MATCH`, filtering the results based on vector similarity.
+
 m| xref::clauses/order-by.adoc[ORDER BY [ASC[ENDING\] \| DESC[ENDING\]\]]
 | A sub-clause following `RETURN` or `WITH`, specifying that the output should be sorted in either ascending (the default) or descending order.