chore: update docs about the default standard

README.md

@@ -11,9 +11,11 @@ Here is a full example:
 ```cmake
 cmake_minimum_required(VERSION 3.16)
 
-# set a default CXX standard used by the external tools like clang-tidy and cppcheck
+# uncomment to set a default CXX standard for the external tools like clang-tidy and cppcheck
+# and the targets that do not specify a standard.
+# If not set, the latest supported standard for your compiler is used
 # You can later set fine-grained standards for each target using `target_compile_features`
-set(CMAKE_CXX_STANDARD 17)
+# set(CMAKE_CXX_STANDARD 17)
 
 # Add ProjectOptions v0.6.0
 # https://github.com/aminya/ProjectOptions
@@ -129,9 +131,11 @@ However, if you still want to change the CMake options on the fly (e.g. to enabl
 ```cmake
 cmake_minimum_required(VERSION 3.16)
 
-# set a default CXX standard used by the external tools like clang-tidy and cppcheck
+# uncomment to set a default CXX standard for the external tools like clang-tidy and cppcheck
+# and the targets that do not specify a standard.
+# If not set, the latest supported standard for your compiler is used
 # You can later set fine-grained standards for each target using `target_compile_features`
-set(CMAKE_CXX_STANDARD 17)
+# set(CMAKE_CXX_STANDARD 17)
 
 # Add ProjectOptions v0.6.0
 # https://github.com/aminya/ProjectOptions