Document URL: https://docs.openshift.com/container-platform/3.11/dev_guide/builds/advanced_build_operations.html#build-pruning

Section Number and Name: Builds/Advanced Build Operations/Build Pruning

Describe the issue: doc incorrectly states that completed builds are persisted indefinitely. In 3.11 and above only the 5 most recent builds for Completed and Failed are retained by default.

Suggestions for improvement: Update the 3.11 as follows -
"By default, the five most recent Completed builds and the five most recent Failed builds are retained."

The doc should also note that removing `successfulBuildsHistoryLimit` and/or `failedBuildsHistoryLimit` field in the BuildConfig spec will cause builds of the respective category to be retained indefinitely.

Additional information: DevEx will also need to update their API doc note in https://github.com/openshift/api/blob/release-3.11/build/v1/types.go#L904