Docs: correct mode-switch docs — Esc/Tab both open the overview menu

Tab is an alternate binding for the overview menu, not a direct
mode toggle; mode switching happens via the menu buttons.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

README.md

@@ -35,8 +35,8 @@ while hunters try to find them. Pure online PvP with an extended traversal kit
   volumetric probes) and **mantle/top-out**.
 - **Cinemachine orbit camera** — mouse look, interpolated zoom, smoothed orbit,
   collision deocclusion, plus **HeroCutout** occlusion fade (soft cone cutout).
-- **Game modes** (extensible state machine, Tab): Player Control, Paint,
-  First Person (hunter) and Free Cam (spectator).
+- **Game modes** (extensible state machine, switched via the overview menu):
+  Player Control, Paint, First Person (hunter) and Free Cam (spectator).
 - **Rendering** — URP Deferred+ with **HTrace WSGI** global illumination
   (auto-disabled in the lobby), custom URP ports of the ArchViz shaders,
   shell-based fur that tints with the painting, skybox environment updater.
@@ -54,11 +54,10 @@ while hunters try to find them. Pure online PvP with an extended traversal kit
 | Space | Jump |
 | Mouse | Look / orbit camera |
 | Mouse wheel | Zoom |
-| Tab | Switch mode (Player Control ⇄ Paint) |
 | Left click | Paint (Paint mode) / shoot (hunter) |
 | Right click (hold) | Orbit camera in Paint mode |
 | E | Self-ping / taunt (hider, seek phase) |
-| Esc | Overview menu (pause, session browser, match results) |
+| Esc / Tab | Overview menu (mode switching, pause, session browser, match results) |
 
 ## Getting started