Follow cl-textrender 03ab0f6: no global nickname textrender
The package cl-textrender has no global nickname any more. The
examples run in a package that gives it the local nickname tr, which
Home and Getting Started show, and prose names its symbols in full.
font-glyph-id, glyph-text-index, the outline cache, map-layout-glyphs in
the raster backend, glyph-region and glyph-image-offset; line-box,
line-content and run-box in place of line and run edges; and
map-layout-fields for distance fields.
Guides to fonts, layout, styled text and fallback, typography, vertical
text, coordinates, carets and selection, glyph outlines and the three
optional systems; recipes; a full API reference for every exported
symbol; errors, threads and lifetimes, the layout pipeline, limitations,
and platforms and testing.
