minor #9264 Note about trailing-slash when using Finder with FTP (chucky2305, javiereguiluz)

This PR was submitted for the 4.0 branch but it was merged into the 2.7 branch instead (closes #9264).

Discussion
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Note about trailing-slash when using Finder with FTP

Added a short note on how to use the finder with FTP. There was nothing written about the need of the trailing slash.

Commits
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1b9f488 Reword
0ff04fd Update finder.rst
8a8ba4f Update finder.rst

Author: javiereguiluz

components/finder.rst

@@ -117,6 +117,10 @@ It's also possible to ignore directories that you don't have permission to read:
 As the Finder uses PHP iterators, you can pass any URL with a supported
 `protocol`_::
 
+    // always add a trailing slash when looking for in the FTP root dir
+    $finder->in('ftp://example.com/');
+
+    // you can also look for in a FTP directory
     $finder->in('ftp://example.com/pub/');
 
 And it also works with user-defined streams::