fix Sphinx error "docstring of dyn.core.SessionEngine.new_session:4: WARNING: Inline emphasis start-string without end-string.".
fix Sphinx error "docstring of dyn.core.SessionEngine.new_session:4: WARNING: Inline emphasis start-string without end-string.".

Marchowes/dyn-python,dyninc/dyn-python,mjhennig/dyn-python