Fix Sphinx warning about cmake code blockv5.72.0-rc1v5.72.0

Lexer for CMake could not parse this broken grammar,
because it is ".cmake.in", not just ".cmake".

CMake itself solves this problems by declaring such code blocks
as generic "::" blocks instead. For example, take a look at the
last code block at CMakePackageConfigHelpers help page:

 - https://cmake.org/cmake/help/v3.18/module/CMakePackageConfigHelpers.html#example-generating-package-files
 - https://github.com/Kitware/CMake/blob/0464298956a204578aa8421ca0b84c089a97e0aa/Modules/CMakePackageConfigHelpers.cmake#L208

0 files changed, 0 insertions, 0 deletions