[#7707] minor tweak

Author: xabbuh

form/direct_submit.rst

@@ -93,7 +93,7 @@ method, pass the submitted data directly to
     When the second parameter ``$clearMissing`` is ``false``, like with the
     "PATCH" method, the validation extension will only handle the submitted
     fields. If the underlying data needs to be validated, this should be done
-    manually, i.e using the validator.
+    manually, i.e. using the validator.
 
 .. _form-submit-request: