GIF: Update sort flag docs

public/gif/getNodeUi.js

@@ -131,11 +131,7 @@ const NODE_UI_FNS = {
               packedField.sortFlag ? 1 : 0
             }, which means that the colors in the global color table are${
               packedField.sortFlag ? "" : "n't"
-            } sorted. Sorting the color table can improve compression.${
-              packedField.globalColorTableFlag
-                ? ""
-                : " However, there is no global color table in this GIF, so this bit is ignored."
-            }`,
+            } sorted. This used to be important when memory was more scarce, but it's not really important anymore.`,
           ),
           li(
             `The last three bits (${