[docs] LICENSE max 80 char per line

[oliviertassinari]

We are not respecting the 80 chars per line rule on our commercial license file. This leads to a scrollbar in https://unpkg.com/browse/@mui/x-license-pro@5.11.0/LICENSE, I have to scroll horizontally to read everything. It's annoying.

Compare it to the MIT license: https://unpkg.com/browse/@mui/x-data-grid@5.11.0/LICENSE.

With this fix it feels like this 😌:

[mui-bot]

These are the results for the performance tests:

Test case	Unit	Min	Max	Median	Mean	σ
Filter 100k rows	ms	242	440.4	370.2	337.96	78.652
Sort 100k rows	ms	472.7	816.4	616.6	651.3	130.435
Select 100k rows	ms	124	259	185.3	180.96	47.773
Deselect 100k rows	ms	98.6	148.2	143.7	131.3	17.528

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