sphinxdocs: fix rendering of args in directives with empty doc #2313
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This fixes a bug where tag-classes/functions that didn't have a doc string, but did
have arguments/attributes, would render the args/attrs immediately after the directive
line, which made them get interpreter as direction options (settings that apply to
the overall directive) instead of doc fields nested within the directive (separate
block-level elements that get rendered).
To fix, update the code to ensure there's a newline between the directive line and
subsequent arg/attr lines. Also adds tests for this.