Update PULL_REQUEST_TEMPLATE.md

.github/PULL_REQUEST_TEMPLATE.md

@@ -9,7 +9,7 @@ This PR fixes
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 ## ToDo
-<!-- Add things, you still want to do. It is recommend to put "[DNM]", "[DONOTMERGE]", "[WIP]" or "[WORKINPROGRESS]" into the title of your PR if you still want to work on this PR, but just do not want to -->
+<!-- Add things, you still want to do. It is recommend to put "[DNM]", "[DONOTMERGE]", "[WIP]" or "[WORKINPROGRESS]" **into the title** of your PR if you still want to work on this PR, but just do not want to have it merged yet. -->
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