Fix documentation: LuaJit is enabled by default

Docs/GettingStarted.dox

@@ -111,7 +111,7 @@ A number of build options can be defined when invoking the build scripts or when
 |URHO3D_64BIT         |*|Enable 64-bit build, the default is set based on the native ABI of the chosen compiler toolchain|
 |URHO3D_ANGELSCRIPT   |1|Enable AngelScript scripting support|
 |URHO3D_LUA           |1|Enable Lua scripting support|
-|URHO3D_LUAJIT        |0|Enable Lua scripting support using LuaJIT (check LuaJIT's CMakeLists.txt for more options)|
+|URHO3D_LUAJIT        |1|Enable Lua scripting support using LuaJIT (check LuaJIT's CMakeLists.txt for more options)|
 |URHO3D_LUAJIT_AMALG  |*|Enable LuaJIT amalgamated build (LuaJIT only); default to true when LuaJIT is enabled|
 |URHO3D_SAFE_LUA      |0|Enable Lua C++ wrapper safety checks (Lua/LuaJIT only)|
 |URHO3D_LUA_RAW_SCRIPT_LOADER  |0|Prefer loading raw script files from the file system before falling back on Urho3D resource cache. Useful for debugging (e.g. breakpoints), but less performant (Lua/LuaJIT only)|