Issue #2501909 by pguillard, pjbaert, shwetaneelsharma, jhodgdon, ifrik: Update the UI texts for the Contact module

Issue #2388247 by pguillard, snehi, joelpittet, sriharsha.uppuluri: Documentation refers to _theme() function, which has been removed

Issue #2489450 by LewisNyman, marieke_h, kfitz, jcnventura, jibla, Bojhan, manauwarsheikh, matthodgson: Remove unnecessary focused/hover effects on details and vertical tabs

Issue #2623708 by lauriii, aspilicious, joelpittet: Whitelist instances instead of specific classes in Twig sandbox policy

Issue #2541252 by HOG, finnsky, LewisNyman, nlisgo, saki007ster, alvar0hurtad0, maris.abols, pjbaert, bruvers, emma.maria, ti2m: Replace the .region-content ul/ol selector with text-formatted

Issue #2625138 by Oleksiy, almaudoh: EntityRepository::loadEntityByUuid() implementation does not match EntityRepositoryInterface::loadEntityByUuid() @return documentation

(cherry picked from commit 8d6a091a)

(cherry picked from commit 3bbea427)

(cherry picked from commit 2ddd4bf6)

(cherry picked from commit e0516e39)

Issue #2606058 by MattA, priya.chat, alexpott: Documentation for the ConfigEntityType annotation class does not reference the correct entity class

(cherry picked from commit 8fe13ff1)

Issue #2614604 by rakesh.gectcr, dawehner: PHPdoc is missing for an overridden function in class ConditionManager

(cherry picked from commit b33ed035)

Issue #2605726 by edxxu, rakesh.gectcr: Wrong @return doc for \Drupal\Core\DrupalKernel::getModuleFileNames()

(cherry picked from commit a20c8c4f)

(cherry picked from commit 5da78abd)

(cherry picked from commit ef23f6d4)

Issue #2564577 by snehi, borisson_, Wim Leers, r_sharma08, lauriii: Improve comments on PlaceholderGeneratorInterface::shouldAutomaticallyPlaceholder() and DynamicPageCacheSubscriber::shouldCacheResponse()

Issue #2612618 by anil280988, r_sharma08, Cottser, davidhernandez, kaushalkishorejaiswal: Add README.txt file to Stable explain its role as a backwards compatibility layer

(cherry picked from commit d1d0c6e6)

(cherry picked from commit 96f86e68)

Issue #2607332 by r_sharma08, ashhishhh, snehi, pjonckiere, dawehner: Missing @return tag in getActiveHelp(), denormalize(), createBookNode()

(cherry picked from commit 0a97f790)

Issue #2628702 by zerolab, joachim: hook_entity_extra_field_info() @return references non-existent method

(cherry picked from commit 010b9ec0)

Issue #2600718 by rakesh.gectcr, xjm, Mile23, dawehner: Add composer.json to \Drupal\Component\Bridge component

Issue #2105583 by neclimdul, tim.plunkett, dawehner, Mile23: Add some sane strictness to phpunit tests to catch risky tests

(cherry picked from commit 136b1d45)

Issue #2623790 by roderik, priya.chat, stefan.r: Update SessionManager::migrateStoredSession() method comment

(cherry picked from commit 820b2f53)

(cherry picked from commit c26981d8)

(cherry picked from commit 09c51315)

Issue #2606344 by rakesh.gectcr, aneeshthankachan, dawehner, cilefen: Wrong @param doc for construct function in class CoreServiceProvider

(cherry picked from commit 74493510)

Issue #2604018 by heykarthikwithu, snehi, kaushalkishorejaiswal, pjonckiere: Add @param documentation in __construct() of User module

(cherry picked from commit cbe1e395)