Update readme.

README.md

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 ## XT Toolchain
 This is a LLVM/Clang/LLD based mingw-w64 toolchain. It currently supports C and C++, and provides
 a variety of tools including IDL, message and resource compilers. The XT Toolchain is also the
-official build environment for compiling XT software, including the FerretOS. Currently, it is
+official build environment for compiling XT software, including the XT OS. Currently, it is
 targeted at Linux host only, however it should be possible to build it in MSYS2 as well.
 
 Benefits of a LLVM based MinGW toolchain are: