[SUREFIRE-1944] Fix Usage page for maven-surefire-plugin

**[Konrad Windszus](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=kwin)** opened **[SUREFIRE-1944](https://issues.apache.org/jira/browse/SUREFIRE-1944?redirect=false)** and commented

According to https://maven.apache.org/surefire/maven-failsafe-plugin/usage.html both goals "integration-test" and "verify" can be added to the same execution. This will never make the build fail though and also according to [Karl Heinz Marbaise](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=khmarbaise) answer in https://stackoverflow.com/a/16798160 you need two different executions.

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**Affects:** 3.0.0-M5

Start with the maven-failsafe-plugin Usage page at maven.apache.org/surefire/maven-failsafe-plugin/usage.html and review the instructions for the integration-test and verify goals. Confirm the documented execution layout against the issue’s cited behavior and reference answer. Done means the page accurately explains that separate executions are needed for the build to fail as expected.

Written by the indexing model from the issue text.