Update docs/src/UserGuide/faq.md

docs/src/UserGuide/faq.md

@@ -160,7 +160,9 @@ ds_lonlat = ds[Lon=1 .. 5, Lat=5 .. 10]
 In this case, if we subset by the common dimension/s, this works the same as for YAXArrays, Cubes, and datasets that share all their dimensions.
 
 But we can also subset a variable by the values of another variable with which it shares some dimensions.
-**Important:** If your data is not loaded into memory, the selection will be too slow. So, you have load into memory, at least, the variable with which you make the selection.
+!!! warning
+     If your data is not loaded into memory, the selection will be too slow. So, you have load into memory, at least, the variable with which you make the selection.
+
 Let's make an example.
 ```@example howdoi
 using YAXArrays