[samigo-team] SAM-1705 better readability of instructor comments

[Sam Ottenhoff]

There is a very tiny patch to improve readability of instructor comments by
adding a couple of line breaks after the student submission and before the
instructor comments. The patch is from Umeå universitet in Sweden.

https://jira.sakaiproject.org/browse/SAM-1705

If there are no objections, I will commit to trunk.....
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