so, the proper Sphinx format to doc param types is:

    :type enable_retries: bool

when the type is a built in type, no decoration is needed. if type was a non-built-in class, you would do:

    :type enable_retries: :class:`~full.reference.to.Class`

note the no space after :class:,
the ~ will make Sphinx just render the last part of the reference and create a hyperlink to the source.