Document array_remove translation

See #3078

Author: roji

conceptual/EFCore.PG/mapping/array.md

@@ -37,6 +37,7 @@ array1.SequenceEqual(array2)                  | [array1 = array2](https://www.po
 arrayNonColumn.Contains(element)              | [element = ANY(arrayNonColumn)](https://www.postgresql.org/docs/current/static/functions-comparisons.html#AEN21104)                      | Can use regular index
 arrayColumn.Contains(element)                 | [arrayColumn @> ARRAY\[element\]](https://www.postgresql.org/docs/current/functions-array.html#ARRAY-OPERATORS-TABLE)                    | Can use GIN index
 array.Append(element)                         | [array_append(array, element)](https://www.postgresql.org/docs/current/functions-array.html#ARRAY-FUNCTIONS-TABLE)                       | Added in 6.0
+array.Where(i => i != 8)                      | [array_remove(array, value)](https://www.postgresql.org/docs/current/functions-array.html#ARRAY-FUNCTIONS-TABLE)                         | Added in 9.0
 array1.Concat(array2)                         | [array1 \|\| array2](https://www.postgresql.org/docs/current/functions-array.html#ARRAY-FUNCTIONS-TABLE)                                 | Added in 6.0
 array.IndexOf(element)                        | [array_position(array, element) - 1](https://www.postgresql.org/docs/current/functions-array.html#ARRAY-FUNCTIONS-TABLE)                 | Added in 6.0
 array.IndexOf(element, startIndex)            | [array_position(array, element, startIndex + 1) - 1](https://www.postgresql.org/docs/current/functions-array.html#ARRAY-FUNCTIONS-TABLE) | Added in 6.0

conceptual/EFCore.PG/release-notes/9.0.md

@@ -59,7 +59,9 @@ Thanks to [@ChrisJollyAU](https://github.com/ChrisJollyAU) and [@Timovzl](https:
 
 ## Other new features
 
-Version 9.0 contains other smaller features and bug fixes, [see the 9.0.0 milestone](https://github.com/npgsql/efcore.pg/milestone/61?closed=1) for the full list of Npgsql EF provider issues.
+* Translate `array.Where(i => i != x)` to `array_remove(array, x)`
+
+See the [9.0.0 milestone](https://github.com/npgsql/efcore.pg/milestone/61?closed=1) for the full list of Npgsql EF provider issues.
 
 ## Breaking changes