Update iteration.Rmd (#231)

iteration.Rmd

@@ -228,7 +228,7 @@ Typically you'll be modifying a list or data frame with this sort of loop, so re
 There are three basic ways to loop over a vector. So far I've shown you the most general: looping over the numeric indices with `for (i in seq_along(xs))`, and extracting the value with `x[[i]]`. There are two other forms:
 
 1.  Loop over the elements: `for (x in xs)`. This is most useful if you only
-    care about side-effects, liking plotting or saving a file, because it's
+    care about side-effects, like plotting or saving a file, because it's
     difficult to save the output efficiently.
 
 1.  Loop over the names: `for (nm in names(xs))`. This gives you name, which