message: Add and update links to wiki
diff: @@ -56,9 +56,10 @@ The manual of the extension is maintained as a [wiki](https://github.com/James-Y
  - [Mathematical font commands](https://github.com/James-Yu/LaTeX-Workshop/wiki/Snippets#Mathematical-font-commands)
  - [Surrounding text](https://github.com/James-Yu/LaTeX-Workshop/wiki/Snippets#surrounding-text)
  - [Miscellaneous actions](https://github.com/James-Yu/LaTeX-Workshop/wiki/Snippets#Miscellaneous-Actions)
  -- [Hovering features](https://github.com/James-Yu/LaTeX-Workshop/wiki/Hover)
  +- [Hovering and previewing features](https://github.com/James-Yu/LaTeX-Workshop/wiki/Hover)
  - [Documentation of a package](https://github.com/James-Yu/LaTeX-Workshop/wiki/Hover#documentation-of-a-package)
  - [Previewing equations](https://github.com/James-Yu/LaTeX-Workshop/wiki/Hover#previewing-equations)
  + - [Tikz preview](https://github.com/James-Yu/LaTeX-Workshop/wiki/Hover#tikz-preview)
  - [Previewing citation details](https://github.com/James-Yu/LaTeX-Workshop/wiki/Hover#previewing-citation-details)
  - [Previewing references](https://github.com/James-Yu/LaTeX-Workshop/wiki/Hover#previewing-references)
  - [Documentation of a command](https://github.com/James-Yu/LaTeX-Workshop/wiki/Hover#documentation-of-a-command)
  @@ -130,11 +131,11 @@ This is not a complete list but rather a preview of some of the coolest features
  <img src="https://github.com/James-Yu/LaTeX-Workshop/raw/master/demo_media/auto item.gif" alt="auto \item demo" height="80px">
  -- Preview on hover. Hovering over the start tag of a math environment causes a mathjax preview to pop up.
  +- [Preview on hover](https://github.com/James-Yu/LaTeX-Workshop/wiki/Hover#previewing-equations). Hovering over the start tag of a math environment causes a mathjax preview to pop up.
  <img src="https://github.com/James-Yu/LaTeX-Workshop/raw/master/demo_media/hover.gif" alt="equation hover demo" height="120px">
  -- Tikz picture preview.
  +- [Tikz picture preview](https://github.com/James-Yu/LaTeX-Workshop/wiki/Hover#tikz-preview)
  <img src="https://github.com/James-Yu/LaTeX-Workshop/raw/master/demo_media/tikz-preview.gif" alt="tikz preview demo">
  