Surge XT manual - 04 style update, 03 tweaks

[j5v]

Notes on style update for Surge XT manual, chapter 04

Style notes

• For consistency with the UI, we should stay with "enable"/"disable". Ideally, we'd change both docs and UI to use inclusive language "activate"/"deactivate".

Decisions

• I've added a warning to Global Hard Clip... options. We should remove it if this could get us into legal trouble for steps that might still be unsafe.

  Warning: Change Global Hard Clip with care. Loud sounds increase the risk of damaging equipment or hearing. You should also limit sounds in your DAW or downstream equipment. Take special care with feedback, effects, and resonance features.

• Text "Main Menu" doesn't appear in the UI, so we should call it "the main menu". "Menu" does, but "Menu" is ambiguous.

Docs todos (moved into #348)

• Patch browser screenshot needs update, to show the Undo UI.
• Save dialog screenshot needs update, to show "Store tuning in patch"
• Cross-reference MPE things (Dual/split, Status button, main menu).
• Some cross-references (in Polyphony limit) should jump more precisely to related content. Use custom anchors, or create lower-level headings.
• Make "Surge XT is best used..." active.