Update README.md

Author: dmlarionov

README.md

@@ -268,9 +268,7 @@ var tasks = await client.GetActiveTasksAsync();
 ```csharp
 // CRUD
 await rebels.AddAsync(rebel);
-await rebels.AddAsync(rebel, batch: true);
 await rebels.AddOrUpdateAsync(rebel);
-await rebels.AddOrUpdateAsync(rebel, batch: true);
 await rebels.RemoveAsync(rebel);
 var rebel = await rebels.FindAsync(id);
 var rebel = await rebels.FindAsync(id, withConflicts: true);
@@ -400,7 +398,7 @@ await _rebels.FindAsync("1", new FindOptions { Rev = "1-xxx" });
 await _rebels.AddOrUpdateAsync(r, new AddOrUpdateOptions { Rev = "1-xxx" });
 ```
 
-For attachements revisions are supported by 'CouchAttachment' class which is passing 'DocumentRev' to 'DownloadAttachmentAsync(..)' and 'DownloadAttachmentAsStreamAsync(..)'.
+For attachements revisions are supported by `CouchAttachment` class which is passing `DocumentRev` to `DownloadAttachmentAsync(..)` and `DownloadAttachmentAsStreamAsync(..)`.
 
 ## DB Changes Feed