Merge pull request #2469 from xfq/css-transforms-2

[css-transforms-2] Typo fix

[css-text-3] More accurate description of Appendix E

[css-text-3] Add appendix on language tagging, explain its relationship to writing system and typographic conventions, and make this information more prominent. Fixes #2015 and fixes #1015.

[css-text-3] Improve line-break shaping cross-links.

[css-text-3] Clarify that white space trimming at the start/end of the line ignores inline box boundaries. <https://lists.w3.org/Archives/Public/www-style/2018Mar/0040.html> Fixes #1997

[css-text-3] Make a computed 'letter-spacing' value of zero return a resolved value of 'normal' because WebKit engineers. <https://lists.w3.org/Archives/Public/www-style/2018Mar/0040.html> Fixes #1484.

[css-text-3] Update DoC

[css-text-3] Link to i18n typography index from intro.

[css-display-3] Update Changes list

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