* lisp/textmodes/glyphless-mode.el (glyphless-mode-types): Fix
spelling of "bidirectional".
* lisp/international/characters.el (char-acronym-table): Fix
acronyms for LRI and RLI: use their accepted shorthands.
(glyphless-char-display-control): Fix spelling of doc string.
* doc/lispref/display.texi (Glyphless Chars): Fix spelling and add
a cross-reference.