Format guide

The format guide for MOSN documentation.

Format standard

• Edit the document body in the Markdown format.
• Start with Heading 2 in the document body.
• Use local images, save them to the same directory as that of the index.md file, and use relative paths for references.
• Specify the languages for all code.
• Use ordered and unordered lists separately, to avoid format confusion.
• Enclose a separate URL with <URL>.
• Enclose uncommon terms and code phrases with grave accents (`).

Last modified December 2, 2022: Bump tar from 4.4.8 to 4.4.19 in /themes/docsy/userguide (942c999)