minor #6803 Remove complex speech pattern (micheal)

This PR was submitted for the 3.1 branch but it was merged into the 2.7 branch instead (closes #6803).

Discussion
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Remove complex speech pattern

It isn't "wrong" but it complicates the sentence for the reader who is trying to learn about this topic.

Commits
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a0596f6 Remove complex speech pattern

Author: weaverryan

form/form_collections.rst

@@ -614,7 +614,7 @@ Template Modifications
 
 The ``allow_delete`` option has one consequence: if an item of a collection
 isn't sent on submission, the related data is removed from the collection
-on the server. The solution is thus to remove the form element from the DOM.
+on the server. The solution is to remove the form element from the DOM.
 
 First, add a "delete this tag" link to each tag form: