fix issue

quarto/integrals/volumes_slice.qmd

@@ -814,7 +814,7 @@ let
 end
 ```
 
-(Be careful, the radius in the formula $V=\int_a^b \pi r(u)^2 du$ is from the line $x=\log(2), further, the constraint $x \geq 0$ needs attention.)
+(Be careful, the radius in the formula $V=\int_a^b \pi r(u)^2 du$ is from the line $x=\log(2)$, further, the constraint $x \geq 0$ needs attention.)
 
 
 ```{julia}