Link markup issue

[goedwig]

There's a problem with markup of this link related to the `" combination that causes monospace font expanding further than expected.

book-site/content/extra/internals-of-sets-and-dicts/index.adoc

Line 385 in 8546e1b

The second is called https://docs.python.org/3/whatsnew/3.6.html#new-dict-implementation["compact `dict`"], and landed in Python 3.6.