Fix database README.md

Fixes #172

Author: samtstern

database/README.md

@@ -13,7 +13,7 @@ In your app, create a class that represents the data from Firebase that you want
 
 So say we have these chat messages in our Firebase database:
 
-![Chat messages in dashboard](doc-images/chat-messages.png "Chat messages in console")
+![Chat messages in dashboard](../doc-images/chat-messages.png "Chat messages in console")
 
 We can represent a chat message with this Java class:
 
@@ -217,7 +217,7 @@ RecyclerView is the new preferred way to handle potentially long lists of items.
 can contain many items, there is an `FirebaseRecyclerAdapter` too. Here's how you use it:
 
 1. Create a custom ViewHolder class
-2. Create a custom subclass FirebaseListAdapter
+2. Create a custom subclass FirebaseRecyclerAdapter
 
 The rest of the steps is the same as for the `FirebaseListAdapter` above, so be sure to read that first.