Split comment into several lines

This removes the horizontal scrollbar in the java examples.

doc/user/project/merge_requests/test_coverage_visualization.md

@@ -97,7 +97,10 @@ test-jdk11:
       - target/site/jacoco/jacoco.xml
 
 coverage-jdk11:
-  stage: visualize # Must be in a stage later than test-jdk11's stage. The visualize stage does not exist by default. Please define it first, or chose an existing stage like deploy.
+  # Must be in a stage later than test-jdk11's stage. 
+  # The `visualize` stage does not exist by default.
+  # Please define it first, or chose an existing stage like `deploy`.
+  stage: visualize
   image: haynes/jacoco2cobertura:1.0.3
   script:
     # convert report from jacoco to cobertura
@@ -134,7 +137,10 @@ test-jdk11:
       - build/jacoco/jacoco.xml
 
 coverage-jdk11:
-  stage: visualize # Must be in a stage later than test-jdk11's stage. The visualize stage does not exist by default. Please define it first, or chose an existing stage like deploy.
+  # Must be in a stage later than test-jdk11's stage. 
+  # The `visualize` stage does not exist by default.
+  # Please define it first, or chose an existing stage like `deploy`.
+  stage: visualize
   image: haynes/jacoco2cobertura:1.0.3
   script:
     # convert report from jacoco to cobertura