DOC-5362 added dialect 2 notes for C#

Author: andy-stark-redis

content/develop/clients/dotnet/queryjson.md

@@ -22,6 +22,14 @@ run queries against the index. It then goes on to show the slight differences
 in the equivalent code for [hash]({{< relref "/develop/data-types/hashes" >}})
 documents.
 
+{{< note >}}From v1.0.0 onwards, `NRedisStack` uses query dialect 2 by default.
+Redis query engine methods such as [`FT().Search()`]({{< relref "/commands/ft.search" >}})
+will explicitly request this dialect, overriding the default set for the server.
+See
+[Query dialects]({{< relref "/develop/interact/search-and-query/advanced-concepts/dialects" >}})
+for more information.
+{{< /note >}}
+
 ## Initialize
 
 Make sure that you have [Redis Open Source]({{< relref "/operate/oss_and_stack" >}})

content/develop/clients/dotnet/vecsearch.md

@@ -36,6 +36,13 @@ for the embeddings. The code is first demonstrated for hash documents with a
 separate section to explain the
 [differences with JSON documents](#differences-with-json-documents).
 
+{{< note >}}From v1.0.0 onwards, `NRedisStack` uses query dialect 2 by default.
+Redis query engine methods such as [`FT().Search()`]({{< relref "/commands/ft.search" >}})
+will explicitly request this dialect, overriding the default set for the server.
+See
+[Query dialects]({{< relref "/develop/interact/search-and-query/advanced-concepts/dialects" >}})
+for more information.
+{{< /note >}}
 ## Initialize
 
 The example is probably easiest to follow if you start with a new