From The Death of Meta Tags:
There are >> for the new paragraph, ** for bold, and _ for italic.
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The code (and really the posts) for the Stack Exchange blog is now openly hosted on GitHub.
On the blog they mention an open ear policy to any issues, fixes or improvements you may have:
If you have suggestions for how to make the new blog better, create an issue and one of our developers will take a look at it (probably me). If you're a developer, we encourage you to take a look at the source code and make pull requests for changes as well.
Typos and minor formatting bungles like this don't seem at all like they fall outside of empowering yourself to send in a pull request to fix it.
Thanks for pointing out - this was actually resolved with this commit.