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

Issue #2547707 by kekkis, screon, deepakaryan1988, latikas, jhodgdon, hussainweb, teemuaro, Crell, HeimdallJHM: Split routing documentation out of menu.api.php