fix interface description

Signed-off-by: Wen Xu <wenxuamz@amazon.com>

pkg/block/fetcher.go

@@ -172,8 +172,8 @@ func DefaultModifiedLabelValues() [][]string {
 
 // Fetcher interface to retieve blockId information from a bucket.
 type BlockIDsFetcher interface {
-	//Get active blocksIds returning it via channel (streaming) and response.
-	//Here active blocks are blocks which contain meta.json, while partial blocks are blocks without meta.json
+	// GetActiveBlocksIDs returning it via channel (streaming) and response.
+	// Active blocks are blocks which contain meta.json, while partial blocks are blocks without meta.json
 	GetActiveAndPartialBlockIDs(ctx context.Context, ch chan<- ulid.ULID) (partialBlocks map[ulid.ULID]bool, err error)
 }