Explain in wxPlatformInfo docs that it means bitness when it says architecture

In the context of wxPlatformInfo, 'architecture' means either '32 bit' or
'64 bit'. Anywhere outside the context of wxPlatformInfo, this concept is
known as 'bitness'.

For the rest of the world, 'architecture' generally refers to the CPU
instruction set architecture, i.e. something like x86, x86_64, arm64, whereas
'operating system architecture' refers to the design of separating kernel
space, user space, etc.

interface/wx/utils.h

@@ -970,12 +970,11 @@ bool wxCheckOsVersion(int majorVsn, int minorVsn = 0, int microVsn = 0);
     bit. The check is performed at run-time and may differ from the value
     available at compile-time (at compile-time you can just check if
     <tt>sizeof(void*) == 8</tt>) since the program could be running in
-    emulation mode or in a mixed 32/64 bit system (bi-architecture operating
-    system).
+    emulation mode or in a mixed 32/64 bit system.
 
     @note This function is not 100% reliable on some systems given the fact
           that there isn't always a standard way to do a reliable check on the
-          OS architecture.
+          OS bitness.
 
     @header{wx/utils.h}
 */