text_style: update and fix `vlc_html_color()` documentation

(Split out from MR !7 (closed))

• fix missing mention of rgb[a] form of color support
• function actually works on #RRGGBB[AA] not #[AA]RRGGBB

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approved this merge request

added 88 commits

• f777fec4...bc72dbdd - 86 commits from branch videolan:master
• e5c68739 - text_style: (docs) add mention of rgb[a] form of color support
• b113f2dd - text_style: (docs) fix hex channel order

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merged