Docs: the document.open pages sentence names the file saved without PDF compatibility

docs/mcp.md said that `pages` that name every page "of such a file"
open it from its editing data. The sentence before it is about a file
without editing data, so "such a file" could be read as that file.

The sentence now says "a file saved without PDF compatibility".

Docs: docs/mcp.md.

docs/mcp.md

@@ -687,10 +687,11 @@ page) opens from its editing data alone: its type is made from the file's text d
 area type and type on a path), and what can't be is left out with a warning. Non-native art (the content of a placed
 PDF, which Illustrator shows but doesn't edit and keeps as a PDF inside the editing data) is drawn by the PDF importer,
 as a group named "Non-native art" fitted to the object's box; one whose PDF can't be read is left out with a warning.
+Without editing data it says it can't be opened. `pages` that name every page of a file saved without PDF compatibility also open it from its
+editing data.
 Without editing data it says it can't be opened. `pages` that name every page of such a file also open it from its
 editing data. `file.place` reads it from its editing data too and places the art of the layers that show on artboard
 `page`, clipped to that artboard unless `crop` is `bounding`. `clipboard.importPdf` takes every object of its editing
-data.
 
 What a PDF holds comes in as editable art: soft masks become opacity masks (an alpha mask as a white copy of its art;
 the backdrop colour gives Clip, an inverting transfer function Invert), transparency groups keep isolation and knockout,