Minor enhancements to the Microsoft.Data.Sqlite docs

docs/standard/data/sqlite/async.md

@@ -1,13 +1,13 @@
 ---
 title: Async limitations
-ms.date: 12/13/2019
+ms.date: 09/04/2020
 description: Explains the limitations of the async APIs and some alternatives that you can use instead.
 ---
 # Async limitations
 
 SQLite doesn't support asynchronous I/O. Async ADO.NET methods will execute synchronously in Microsoft.Data.Sqlite. Avoid calling them.
 
-Instead, use [write-ahead logging](https://www.sqlite.org/wal.html) to improve performance and concurrency.
+Instead, use a [shared cache](connection-strings.md#cache) and [write-ahead logging](https://www.sqlite.org/wal.html) to improve performance and concurrency.
 
 [!code-csharp[](../../../../samples/snippets/standard/data/sqlite/AsyncSample/Program.cs?name=snippet_WAL)]
 

docs/standard/data/sqlite/custom-versions.md

@@ -1,6 +1,6 @@
 ---
 title: Custom SQLite versions
-ms.date: 05/14/2020
+ms.date: 09/04/2020
 description: Learn how to use a custom version of the native SQLite library.
 ---
 
@@ -17,6 +17,7 @@ description: Learn how to use a custom version of the native SQLite library.
 | [SQLitePCLRaw.bundle_e_sqlite3](https://www.nuget.org/packages/SQLitePCLRaw.bundle_e_sqlite3) | Provides a consistent version of SQLite on all platforms. Includes the FTS4, FTS5, JSON1, and R*Tree extensions. This is the default. |
 | [SQLitePCLRaw.bundle_e_sqlcipher](https://www.nuget.org/packages/SQLitePCLRaw.bundle_e_sqlcipher) | Provides an unofficial, open-source build of `SQLCipher`. |
 | [SQLitePCLRaw.bundle_green](https://www.nuget.org/packages/SQLitePCLRaw.bundle_green) | Same as `bundle_e_sqlite3`, except on iOS where it uses the system SQLite library. |
+| [SQLitePCLRaw.bundle_sqlite3](https://www.nuget.org/packages/SQLitePCLRaw.bundle_sqlite3) | Uses the system SQLite library. |
 | [SQLitePCLRaw.bundle_winsqlite3](https://www.nuget.org/packages/SQLitePCLRaw.bundle_winsqlite3) | Uses `winsqlite3.dll`, the system SQLite library on Windows 10. |
 | [SQLitePCLRaw.bundle_zetetic](https://www.nuget.org/packages/SQLitePCLRaw.bundle_zetetic) | Uses the official `SQLCipher` builds from Zetetic (not included). |
 

samples/snippets/standard/data/sqlite/AsyncSample/Program.cs

@@ -16,7 +16,7 @@ static async Task Main()
             // Microsoft.Data.Sqlite.
 
             #region snippet_WAL
-            var connection = new SqliteConnection("Data Source=AsyncSample.db");
+            var connection = new SqliteConnection("Data Source=AsyncSample.db;Cache=Shared");
             connection.Open();
 
             // Enable write-ahead logging