remove resolved todos

Signed-off-by: Yuchen Liang <yuchen@neon.tech>

pageserver/src/tenant/remote_timeline_client/download.rs

@@ -235,8 +235,6 @@ async fn download_object<'a>(
                             Ok(chunk) => chunk,
                             Err(e) => return Err(e),
                         };
-                        // TODO(yuchen): might have performance issue when using borrowed version?
-                        // Problem: input is Bytes, does not satisify IO alignment requirement.
                         buffered.write_buffered_borrowed(&chunk, ctx).await?;
                     }
                     let inner = buffered.flush_and_into_inner(ctx).await?;

pageserver/src/virtual_file/owned_buffers_io/write/flush.rs

@@ -17,7 +17,6 @@ pub struct FlushHandle<Buf, W> {
     pub(super) maybe_flushed: Option<FullSlice<Buf>>,
 }
 
-// TODO(yuchen): special actions in drop to clean up the join handle?
 pub struct FlushHandleInner<Buf, W> {
     /// A bi-directional channel that sends (buffer, offset) for writes,
     /// and receives recyled buffer.