Issue #2075889 by kgoel, pwolanin, catch, YesCT, dawehner, mpdonadio,...

Issue #2075889 by kgoel, pwolanin, catch, YesCT, dawehner, mpdonadio, johnshortess, Crell, mradcliffe, alexpott, webchick, ohthehugemanatee: Document that Drupal will handle incoming paths in a consistent and case-insensitive fashion for routing

(cherry picked from commit f8bd8143)