Added (still rather shallow) missing Javadocs for classes in BinaryAttachmentBody hierarchy

src/com/fsck/k9/mail/store/local/BinaryAttachmentBody.java

@@ -12,6 +12,10 @@ import com.fsck.k9.mail.Body;
 import com.fsck.k9.mail.MessagingException;
 import com.fsck.k9.mail.filter.Base64OutputStream;
 
+/**
+ * Superclass for attachments that contain binary data.
+ * The source for the data differs for the subclasses.
+ */
 public abstract class BinaryAttachmentBody implements Body {
     protected String mEncoding;
 

src/com/fsck/k9/mail/store/local/LocalAttachmentBody.java

@@ -9,6 +9,9 @@ import android.net.Uri;
 
 import com.fsck.k9.mail.MessagingException;
 
+/**
+ * An attachment whose contents are loaded from an URI.
+ */
 public class LocalAttachmentBody extends BinaryAttachmentBody {
     private Application mApplication;
     private Uri mUri;

src/com/fsck/k9/mail/store/local/TempFileBody.java

@@ -8,6 +8,9 @@ import java.io.InputStream;
 
 import com.fsck.k9.mail.MessagingException;
 
+/**
+ * An attachment whose contents are contained in a file.
+ */
 public class TempFileBody extends BinaryAttachmentBody {
     private final File mFile;
 

src/com/fsck/k9/mail/store/local/TempFileMessageBody.java

@@ -8,6 +8,10 @@ import org.apache.james.mime4j.util.MimeUtil;
 import com.fsck.k9.mail.CompositeBody;
 import com.fsck.k9.mail.MessagingException;
 
+/**
+ * An attachment containing a body of type message/rfc822
+ * whose contents are contained in a file.
+ */
 public class TempFileMessageBody extends TempFileBody implements CompositeBody {
 
     public TempFileMessageBody(String filename) {