Document iOS 9 as minimum deployment version.

docs/changes.txt

@@ -210,6 +210,7 @@ wxOSX:
 - Allow pasting using Cmd+V in wxTextCtrl with wxTE_PASSWORD style.
 - Update font code to use toll-free bridges from CTFontRef to NSFont or UIFont
 - Add a native implementation for clearing bitmap/window wxGraphicsContexts
+- wxiOS now needs a minimum of iOS 9 for deployment
 
 Unix:
 

docs/doxygen/mainpages/introduction.h

@@ -93,8 +93,8 @@ primary supported compiler is GNU g++.
 supports 32 or 64 bit Intel Macs running OS X 10.7 or later. The port can be
 built either with g++ or clang.
 
-Other platforms (e.g. iOS), compilers (Borland C++ under Windows,
-Sun CC, HP-UX aCC, IBM xlC or SGI mipsPro under Unix) and ports (
+Other platforms (e.g. iOS - with a minimum requirement of iOS 9), compilers (Borland C++
+under Windows, Sun CC, HP-UX aCC, IBM xlC or SGI mipsPro under Unix) and ports (
 wxQT, wxGTK1, wxX11, wxDFB...) are also supported but to a lesser extent.
 Please see the @subpage page_port "platform details page" for more information.
 

docs/doxygen/mainpages/platdetails.h

@@ -173,7 +173,7 @@ For further information, please see the files in docs/qt in the distribution.
 
 wxiOS is a port of wxWidgets using Cocoa touch libraries for iOS. It is very
 basic in it current form, but is included for further improvements and very
-simple applications.
+simple applications. It requires iOS 9 or later and fully supports 64 bit builds.
 
 For further information, please see the files in docs/ios in the distribution.