Link to to_int from rounding functions section

Author: WardBrian

src/functions-reference/real-valued_basic_functions.qmd

@@ -783,8 +783,10 @@ calculations, but the result is likely to be reduced acceptance
 probabilities and less efficient sampling.
 
 The rounding functions cannot be used as indices to arrays because
-they return real values.  Stan may introduce integer-valued versions
-of these in the future, but as of now, there is no good workaround.
+they return real values. For operations over `data` or in the
+`generated quantities` block, the
+[`to_int()` function](integer-valued_basic_functions.qmd#casting-functions)
+ can be used.
 
 <!-- R; floor; (T x); -->
 \index{{\tt \bfseries floor }!{\tt (T x): R}|hyperpage}
@@ -1601,7 +1603,7 @@ The logarithm of one minus the natural exponentiation of x
 Return the natural logarithm of the difference of the natural
 exponentiation of x and the natural exponentiation of y. \begin{equation*}
 \mathrm{log\_diff\_exp}(x,y) = \begin{cases} \log(\exp(x)-\exp(y)) &
-\text{if } +\infty > x \ge y \\[6pt] 
+\text{if } +\infty > x \ge y \\[6pt]
 \textrm{NaN} & \text{otherwise} \end{cases}
 \end{equation*}