The preview shows non-bold text for H2 level headings like
## Overview as shown here:
I don't think this stands out well. I thought about changing it, but I decided it wasn't worth the effort. However, I let it slide, and lo and behold it rendered in bold, just like I wanted it to!
If the rendering engine has been improved from WYSIWYG to semantic syntax to telepathic inference, then let me congratulate the devs on this accomplishment.