update cmake's README.md

build/cmake/README.md

diff --git a/build/cmake/README.md b/build/cmake/README.md
index 3733912..44d42b2 100644
--- a/build/cmake/README.md
+++ b/build/cmake/README.md
@@ -5,22 +5,19 @@
 Build xxHash targets:
 
     cd </path/to/xxHash/>
-    mkdir build
-    cd build
-    cmake ../cmake_unofficial [options]
-    cmake --build .
-    cmake --build . --target install #optional
+    cmake -S build/cmake -B cmake_build
+    cmake --build cmake_build --parallel
+    cmake --install cmake_build
 
 Where possible options are:
-- `-DXXHASH_BUILD_ENABLE_INLINE_API=<ON|OFF>`: adds xxhash.c for the `-DXXH_INLINE_ALL` api. ON by default.
 - `-DXXHASH_BUILD_XXHSUM=<ON|OFF>`: build the command line binary. ON by default
 - `-DBUILD_SHARED_LIBS=<ON|OFF>`: build dynamic library. ON by default.
 - `-DCMAKE_INSTALL_PREFIX=<path>`: use custom install prefix path.
-- `-DDISPATCH=<ON|OFF>`: enable dispatch mode. OFF by default.
+- `-DDISPATCH=<ON|OFF>`: enable dispatch mode. Default is ON for x64 cpus, OFF otherwise.
 
 Add lines into downstream CMakeLists.txt:
 
-    find_package(xxHash 0.7 CONFIG REQUIRED)
+    find_package(xxHash 0.8 CONFIG REQUIRED)
     ...
     target_link_libraries(MyTarget PRIVATE xxHash::xxhash)
 
@@ -31,7 +28,7 @@
     ...
     set(XXHASH_BUILD_ENABLE_INLINE_API OFF) #optional
     set(XXHASH_BUILD_XXHSUM OFF) #optional
-    add_subdirectory(</path/to/xxHash/cmake_unofficial/> </path/to/xxHash/build/> EXCLUDE_FROM_ALL)
+    add_subdirectory(</path/to/xxHash/build/cmake/> </path/to/xxHash/build/> EXCLUDE_FROM_ALL)
     ...
     target_link_libraries(MyTarget PRIVATE xxHash::xxhash)