thermal_control_modes: Add newlines

Author, Primary assignee, Other contributors, and Created are
easier to read if they are on separate lines.

Tested: Copied into https://jbt.github.io/markdown-editor/

Change-Id: If6454d2c27a615bacfcf354e6c278345978f09e2
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/designs/thermal_control_modes.md b/designs/thermal_control_modes.md
index d91f892..6a29901 100644
--- a/designs/thermal_control_modes.md
+++ b/designs/thermal_control_modes.md
@@ -2,10 +2,13 @@
 
 Author:
   Matthew Barth !msbarth
+
 Primary assignee:
   Matthew Barth !msbarth
+
 Other contributors:
   None
+
 Created:
   2019-02-06