Docs (dialogs): Added line about the frameworking adding a close button if a dialog has a header.
Docs (dialogs): Added line about the frameworking adding a close button if a dialog has a header.

hinaloe/jqm-demo-ja,startxfr/jquery-mobile,startxfr/jquery-mobile,arschmitz/jquery-mobile,npmcomponent/cbou-jquery-mobile,hinaloe/jqm-demo-ja,arschmitz/uglymongrel-jquery-mobile,hinaloe/jqm-demo-ja,npmcomponent/cbou-jquery-mobile,arschmitz/jquery-mobile,arschmitz/jquery-mobile,npmcomponent/cbou-jquery-mobile,arschmitz/uglymongrel-jquery-mobile,arschmitz/uglymongrel-jquery-mobile,startxfr/jquery-mobile