(DOCSP-15596): Removed Ubuntu 16.04 from master.

Author: corryroot

source/install/compatibility.txt

@@ -39,7 +39,7 @@ architecture.
    * - SUSE Linux Enterprise Server
      - 12, 15
    * - Ubuntu
-     - 16.04, 18.04, 20.04
+     - 18.04, 20.04
 
 Atlas, Cloud Manager, and Ops Manager Versions
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