[docs] Add default value for Row slot

[cherniavskii]

Just noticed that there's no default value mentioned in docs.

TODO:

• Merge [core] Fix docs:api silent crash #3808 first

[cherniavskii]

I've noticed that yarn docs:api is broken - it silently fails, I will fix it in a separate PR

[mui-bot]

These are the results for the performance tests:

Test case	Unit	Min	Max	Median	Mean	σ
Filter 100k rows	ms	196.1	378.2	293.8	292.26	60.646
Sort 100k rows	ms	375.5	778.6	608.3	596.84	129.079
Select 100k rows	ms	181.3	211	194.2	193.58	10.89
Deselect 100k rows	ms	123.7	218.2	184.4	170.92	37.034

Generated by 🚫 dangerJS against 0fe77dd