Docs: Fix CMake commands for enabling Ccache

docs/developers/Building_Android.md

@@ -62,7 +62,7 @@ Building for Android is a 2-step process. First, native C++ code is compiled to
 This is a traditional CMake project, you can build it from command line or some IDE. You're not required to pass any custom options (except Conan toolchain file), defaults are already good. If you wish to use your own CMake presets, inherit them from our `build-with-conan` preset. Example:
 
 ```
-cmake -S . -B ../build -G Ninja -D CMAKE_BUILD_TYPE=Debug -D CMAKE_COMPILER_LAUNCHER=ccache --toolchain ...
+cmake -S . -B ../build -G Ninja -D CMAKE_BUILD_TYPE=Debug -D CMAKE_CXX_COMPILER_LAUNCHER=ccache -D CMAKE_C_COMPILER_LAUNCHER=ccache --toolchain ...
 cmake --build ../build
 ```
 

docs/developers/Building_Linux.md

@@ -76,7 +76,7 @@ cmake ../vcmi
 **Notice**: The ../vcmi/ is not a typo, it will place makefile scripts into the build dir as the build dir is your working dir when calling CMake.
 
 ## To use ccache:
-`cmake ../vcmi -D CMAKE_COMPILER_LAUNCHER=ccache`
+`cmake ../vcmi -D CMAKE_CXX_COMPILER_LAUNCHER=ccache -D CMAKE_C_COMPILER_LAUNCHER=ccache`
 
 ## Trigger build