Updates for Display chapter of Lisp manual.
* doc/lispref/display.texi (Image Formats): Add imagemagick type. (Image Descriptors): Mention how they are used. (ImageMagick Images): Clarify role of imagemagick-register-types. (Character Display): Don't mention glyph tables. (Display Tables): Use make-glyph-code in example. (Glyphs): Avoid "simple glyph code" terminology. Note that glyph tables are semi-obsolete. De-document create-glyph. (Glyphless Chars): Note that display tables override this. (Bidirectional Display): Copyedits. Introduce "bidirectional reordering" terminology, and use it. * doc/emacs/files.texi (File Conveniences): Clarify Imagemagick discussion. * lisp/image.el (imagemagick-types-inhibit) (imagemagick-register-types): Doc fix.
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