-skip-unused is still in the performance tuning section of the docs

[Le0Developer]

Describe the issue

-skip-unused is now on by default. It no longer needs to be listed in the performance tuning section of the docs.

Links

• https://github.com/vlang/v/blob/master/doc/docs.md#performance-tuning
• https://github.com/vlang/v/blob/master/doc/docs.md#-skip-unused

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_{Huly®: V_0.6-21699}