* spelling correction

install/doc/whatsnew.txt

@@ -11,7 +11,7 @@ Compiler:
   + x86_64/amd64 (Linux) compiler
   + Sparc (Linux) compiler
   + PowerPC MorphOS support
-  + MacOS (classic) compiler (for MPW)
+  + Mac OS (classic) compiler (for MPW)
   + Netware Libc support (-Tnetwlibc)
   + Register variable support (-Or) for all targets
   + MacPas compiler mode (-Mmacpas)
@@ -26,7 +26,7 @@ RTL:
   + x86_64/amd64 Linux support
   + Sparc Linux support
   + PowerPC MorphOS support
-  + MacOS (classic) support (except Sysutils and its dependants)
+  + Mac OS (classic) support (except Sysutils and its dependants)
   + Netware Libc support
   + New heap manager that releases memory back to the OS
   + TThread.Synchronize support
@@ -71,7 +71,7 @@ Misc:
 
 Compiler:
   + ARM (Linux) compiler
-  + Powerpc Darwin (MacOSX) support
+  + PowerPC Darwin (Mac OS X) support
   + reintroduce keyword support
   + added prefetch(const mem) support
   + MacPas compile mode