This PR was submitted for the 3.4 branch but it was squashed and merged into the 2.8 branch instead (closes#10062).Discussion----------[PHPUnitBridge] Explain how to show stack traces<!--If your pull request fixes a BUG, use the oldest maintained branch that containsthe bug (seehttps://symfony.com/roadmap for the list of maintained branches).If your pull request documents a NEW FEATURE, use the same Symfony branch wherethe feature was introduced (and `master` for features of unreleased versions).-->Commits-------a6e1282 [PHPUnitBridge] Explain how to show stack traces

* 3.4:  Simplified the "Release Process" page  [Workflow] Fix typo documentation  Fix mismatched list items  [symfony#9988] fix minor typos  [symfony#10099] update XML and PHP config examples  [symfony#9969] fix a minor typo  [symfony#10022] fix a minor typo  preUpdate Event Listener On Uploaded Imagery  [symfony#10124] fix XML attribute name  [symfony#10062] fix the code block  [PHPUnitBridge] Explain how to show stack traces  Fix docs on trusted hosts  opcode optimizations

* 4.1:  Simplified the "Release Process" page  [Workflow] Fix typo documentation  Fix mismatched list items  typos in sample code  [symfony#9988] fix minor typos  [symfony#10099] update XML and PHP config examples  [symfony#9969] fix a minor typo  [symfony#10022] fix a minor typo  preUpdate Event Listener On Uploaded Imagery  [symfony#9757] fix rst syntax  [symfony#10124] fix XML attribute name  [symfony#10062] fix the code block  [PHPUnitBridge] Explain how to show stack traces  Fix docs on trusted hosts  opcode optimizations