docs: CMakeUserPresets.json.example includes warnings

Author: alandefreitas

CMakeUserPresets.json.example

@@ -15,7 +15,9 @@
       "cacheVariables": {
         "LLVM_ROOT": "C:\\Users\\$env{USERNAME}\\Libraries\\llvm-project\\llvm\\install\\MSVC\\Debug",
         "Clang_ROOT": "C:\\Users\\$env{USERNAME}\\Libraries\\llvm-project\\llvm\\install\\MSVC\\Debug",
-        "CMAKE_EXPORT_COMPILE_COMMANDS": "ON"
+        "CMAKE_EXPORT_COMPILE_COMMANDS": "ON",
+        "CMAKE_CXX_FLAGS": "/W4",
+        "CMAKE_C_FLAGS": "/W4"
       },
       "condition": {
         "type": "equals",
@@ -79,7 +81,9 @@
         "CMAKE_C_COMPILER": "/usr/bin/gcc-13",
         "LLVM_ROOT": "/home/$env{USER}/libraries/llvm-project/llvm/install/Linux/Release",
         "Clang_ROOT": "/home/$env{USER}/libraries/llvm-project/llvm/install/Linux/Release",
-        "CMAKE_EXPORT_COMPILE_COMMANDS": "ON"
+        "CMAKE_EXPORT_COMPILE_COMMANDS": "ON",
+        "CMAKE_CXX_FLAGS": "-Wall -Wextra -Wpedantic -Werror",
+        "CMAKE_C_FLAGS": "-Wall -Wextra -Wpedantic -Werror"
       },
       "vendor": {
         "microsoft.com/VisualStudioSettings/CMake/1.0": {