when vs if clarification

The original "Use when instead of (if …​ (do …​))" made me skip it because I did not have a `do` in my code, only `(if cond something...)`. So I want to clarify that it applies to all single-branch ifs, no matter whether they use do or not.

Author: holyjak

README.adoc

@@ -1313,7 +1313,7 @@ You'll rarely need an actual boolean value in Clojure, but it's useful to know h
 
 === `when` vs `if` [[when-instead-of-single-branch-if]]
 
-Use `when` instead of `(if ... (do ...))`.
+Use `when` instead of `if` with just the truthy branch, as in `(if ... (do ...))`.
 
 [source,clojure]
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