reStructuredText
From Get docs
Sphinx/docs/4.1.x/usage/restructuredtext/index
reStructuredText
reStructuredText (reST) is the default plaintext markup language used by both Docutils and Sphinx. Docutils provides the basic reStructuredText syntax, while Sphinx extends this to support additional functionality.
The below guides go through the most important aspects of reST. For the authoritative reStructuredText reference, refer to the docutils documentation.
