Update tap.md (#1438)

This might not be perfect, but it's better than what's there. :)
petkaantonov · Aug 16, 2017 · 2c9f7a4 · 2c9f7a4
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diff --git a/docs/docs/api/tap.md b/docs/docs/api/tap.md
@@ -12,7 +12,9 @@ title: .tap
 ```js
 .tap(function(any value) handler) -> Promise
 ```
+Essentially like `.then()`, except that the value passed in is the value returned.
 
+This means you can insert `.tap()` into a `.then()` chain without affecting what is passed through the chain.  (See example below).
 
 Unlike [`.finally`](.) this is not called for rejections.