fcoalesce of type list (#3712) link added to news item

NEWS.md

@@ -134,7 +134,7 @@
     #  0.357   0.763   0.292  # now
     ```
 
-18. New function `fcoalesce(...)` has been written in C, and is multithreaded for `numeric` and `factor`. It replaces missing values according to a prioritized list of candidates (as per SQL COALESCE, `dplyr::coalesce`, and `hutils::coalesce`), [#3424](https://github.com/Rdatatable/data.table/issues/3424). It accepts any number of vectors in several forms. For example, given three vectors `x`, `y`, and `z`, where each `NA` in `x` is to be replaced by the corresponding value in `y` if that is non-NA, else the corresponding value in `z`, the following equivalent forms are all accepted: `fcoalesce(x,y,z)`, `fcoalesce(x,list(y,z))`, and `fcoalesce(list(x,y,z))`.
+18. New function `fcoalesce(...)` has been written in C, and is multithreaded for `numeric` and `factor`. It replaces missing values according to a prioritized list of candidates (as per SQL COALESCE, `dplyr::coalesce`, and `hutils::coalesce`), [#3424](https://github.com/Rdatatable/data.table/issues/3424). It accepts any number of vectors in several forms. For example, given three vectors `x`, `y`, and `z`, where each `NA` in `x` is to be replaced by the corresponding value in `y` if that is non-NA, else the corresponding value in `z`, the following equivalent forms are all accepted: `fcoalesce(x,y,z)`, `fcoalesce(x,list(y,z))`, and `fcoalesce(list(x,y,z))`. Being a new function, its behaviour is subject to change particularly for type `list`, [#3712](https://github.com/Rdatatable/data.table/issues/3712).
 
     ```R
     # default 4 threads on a laptop with 16GB RAM and 8 logical CPU