Issue #2568439 by anchal29, hussainweb, priya.chat, r_sharma08,...

Issue #2568439 by anchal29, hussainweb, priya.chat, r_sharma08, drupal.ninja03, anil280988, snehi, tedbow, joyceg, amit.drupal, jhodgdon: profiles/README.txt incorrectly states that installation profiles do not 'have any effect on' already running sites