Update comments

src/library/title.cr

@@ -80,7 +80,7 @@ class Title
   # - When the title exists and its contents signature is still the same, we
   #     return true so it can be reused without rescanning
   def examine(context : ExamineContext) : Bool
-    return false unless Dir.exists? @dir # No title, Remove this
+    return false unless Dir.exists? @dir
     contents_signature = Dir.contents_signature @dir,
       context["cached_contents_signature"]
     return true if @contents_signature == contents_signature

src/storage.cr

@@ -438,7 +438,6 @@ class Storage
       get_db do |db|
         # Detect dangling entry IDs
         trash_ids = [] of String
-        # Use query builder instead?
         query = "select path, id from ids where unavailable = 0"
         unless ids_candidates.nil?
           query += " and id in (#{ids_candidates.join "," { |i| "'#{i}'" }})"