Overload set links could show short description next to them

[ntrel]

See https://dlang.org/library-prerelease/std/algorithm/searching/count.html

Ddox could list the short description next to the overload set links at the top:

• Function count - Counts matches of needle in haystack
• Function count - Counts all elements or elements satisfying a predicate in haystack

Functions where the first sentence is too long could be cut off e.g. after 120 characters.