minor #7920 Tiny clarification to Finder component docs (jordanlev)

This PR was submitted for the 3.4 branch but it was merged into the 2.7 branch instead (closes #7920).

Discussion
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Tiny clarification to Finder component docs

Change wording of how to use Finder Iterator (old wording seemed to suggest that you *can't* iterate via `foreach` loop).

Commits
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1ccb5e0 Tiny clarification to Finder component docs

Author: xabbuh

components/finder.rst

@@ -50,7 +50,7 @@ the Finder instance.
 
 .. tip::
 
-    A Finder instance is a PHP :phpclass:`Iterator`. So, instead of iterating over the
+    A Finder instance is a PHP :phpclass:`Iterator`. So, in addition to iterating over the
     Finder with ``foreach``, you can also convert it to an array with the
     :phpfunction:`iterator_to_array` method, or get the number of items with
     :phpfunction:`iterator_count`.