[Integrated] RFR: Improve error section formatting

[Robin Westberg]

Changeset: 52626b52
Author:    Robin Westberg <rwestberg at openjdk.org>
Date:      2020-04-07 12:41:21 +0000
URL:       https://git.openjdk.java.net/skara/commit/52626b52

Improve error section formatting

Reviewed-by: ehelin

! bots/pr/src/main/java/org/openjdk/skara/bots/pr/CheckRun.java
! bots/pr/src/test/java/org/openjdk/skara/bots/pr/CheckTests.java