The Security Slider manual should reflect the new changes made to the security slider

The Security Slider manual should reflect the new changes mad to the security slider. Right now it says low, medium and high but that should be changed to Standard, Safer and Safest.

!https://tb-manual.torproject.org/en-US/security-slider.html

Trac:
Username: Dbryrtfbcbhgf

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