Document adaptive sorter

[Morwenn]

Document which of the library's sorters are adaptive with regard to which measure of presortedness.

Several questions:

• Make a list?
• Make a box? (a box with ✅/❌ would look cool)
• If a sorter is Enc-adaptive, do we need to mention that it's also Runs-adaptive? (yes if box)
• Include the MOPs we don't implement? (yes)
• How can we make sure that our algorithms are correctly implemented to be MOP-adaptive?