Merge pull request #819 from stan-dev/functions-reference/link-to-to_int

Link to to_int from rounding functions section

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}