Small doc modifications to clarify  Fl::OPTION_ARROW_FOCUS
and interrelate docs for Fl_Input_::tab_nav().



git-svn-id: http://seriss.com/public/fltk/fltk/branches/branch-1.3@10134 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
Fixes STR#3065


git-svn-id: http://seriss.com/public/fltk/fltk/branches/branch-1.3@10135 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
Hmm, reverted some of my doc changes in r10134 -- could swear the option
in question also affected widget focus in a broader way, but apparently not..



git-svn-id: http://seriss.com/public/fltk/fltk/branches/branch-1.3@10136 ea41ed52-d2ee-0310-a9c1-e6b18d33e121