Fix misrendered code on Base Vars page (#1749)

Author: masenf

docs/vars/base_vars.md

@@ -68,7 +68,7 @@ def ticker_example():
     return rx.center(
           rx.vstack(
                 rx.heading(TickerState.ticker, size="3"),
-                rx.text(f"Current Price: {TickerState.price}", font_size="md"),
+                rx.text(f"Current Price: \{TickerState.price}", font_size="md"),
                 rx.text("Change: 4%", color="green"),
             ),