Update source/educators/references/course_development/exercise_tools/…

…multi_select.rst

Co-authored-by: Sarina Canelake <[email protected]>

source/educators/references/course_development/exercise_tools/multi_select.rst

@@ -37,7 +37,7 @@ Example Multi-select Problem
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 In the LMS, learners complete a multi-select problem by selecting the correct answers and leaving the incorrect ones unselected. An example of a completed multi-select
-problem follows selecting the correct answers and leaving the incorrect ones unselected
+problem follows, selecting the correct answers and leaving the incorrect ones unselected.
 
 .. image:: /_images/educator_references/CheckboxExample.png
  :alt: An example multi-select problem in the LMS. This problem was incorrectly