Use setup for the noun

Co-authored-by: brandon s allbery kf8nh <[email protected]>

changelog.d/pr-10646.md

@@ -86,7 +86,7 @@ convert LF values to spaces.
 lineBreaksToSpaces :: String -> String
 ```
 
-With this set up, false positives were possible. An expected value using string
+With this setup, false positives were possible. An expected value using string
 gaps and spaces would match a `concatOutput` modified actual value of
 "foo_bar_baz", where '_' was any of space, LF or CRLF in the unmodified actual
 value. The latter two are false positive matches.