Clean up FILTER (#1204)

Author: JPryce-Aklundh

modules/ROOT/pages/clauses/index.adoc

@@ -44,6 +44,9 @@ m| xref::clauses/with.adoc[WITH ... [AS]]
 m| xref::clauses/unwind.adoc[UNWIND ... [AS]]
 | Expands a list into a sequence of rows.
 
+m| xref::clauses/filter.adoc[FILTER]
+| Adds filters to queries.
+
 m| xref::clauses/finish.adoc[FINISH]
 | Defines a query to have no result.
 

modules/ROOT/pages/deprecations-additions-removals-compatibility.adoc

@@ -216,13 +216,6 @@ FILTER x > 2
 RETURN x
 ----
 
-[source, cypher, role="noheader"]
-----
-UNWIND [1, 2, 3, 4, 5, 6] AS x
-FILTER x > 2
-RETURN x
-----
-
 [source, cypher, role="noheader"]
 ----
 LOAD CSV WITH HEADERS FROM 'file:///companies.csv' AS row