message: update how components check for required dependencies
diff: @@ -139,14 +139,14 @@ Top-level component directory
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  The top-level component directory contains a `CMakeLists.txt`, e.g.,
  -`axom/src/components/sidre/CmakeLists.txt`, which contains the following items:
  +`axom/src/components/sidre/CMakeLists.txt`, which contains the following items:
  #. Checks for necessary dependencies with useful error or warning messages;
  e.g.,::
  - if(NOT HDF5_FOUND)
  - message(FATAL_ERROR "Sidre requires HDF5. Set HDF5_DIR to HDF5 installation.")
  - endif()
  + axom_component_requires(NAME Sidre
  + COMPONENTS SLIC
  + TPLS Conduit )
  #. Subdirectories additions with guards as needed; e.g.,::
  