Place: Word's low, medium and high kashida justification sets Insert Kashidas

A Word paragraph justified with w:jc lowKashida, mediumKashida or
highKashida placed as plain justified type, and its kashida length was
dropped. ECMA-376 Part 1, 17.18.44 (ST_Jc) gives these values a
slightly longer, a medium and the widest kashida length.

Such a paragraph now places justified with Insert Kashidas set to
Short, Medium or Long. A paragraph justified with both, and every other
alignment, still places with Insert Kashidas set to None. VectorCraft
writes no Word or RTF files, so this change does not affect export.

Docs: docs/mcp.md, docs/target-app-parity.md.

docs/mcp.md

@@ -2979,7 +2979,10 @@ left out. `file.place` answers `format: "rtf"`.
 
 A Word document (a ZIP package named `.docx`, or one that holds `word/document.xml`, except a `.txt` file) is placed
 the same way and keeps the same formatting, taken from the document defaults, the paragraph style and the character
-style (and the styles each is based on) and direct formatting; theme fonts are read from the theme part. Table cells
+style (and the styles each is based on) and direct formatting; theme fonts are read from the theme part. A paragraph
+justified with a low, medium or high kashida length (`w:jc` `lowKashida`, `mediumKashida` or `highKashida`) is
+justified with `kashida` `"short"`, `"medium"` or `"long"` (see [Insert Kashidas](#insert-kashidas)), and one
+justified with `both` has none. Table cells
 are separated by tabs and each row is a paragraph. Hidden and deleted text, field instructions, pictures, text boxes,
 headers, footers, notes and list numbers are left out. A package with more than 10,000 files, a part that unpacks to
 more than 16 MiB or nests elements more than 256 deep, and a document with more than 4 MiB of text or 100,000