message: Fix duplicate INSTALL entry
diff: @@ -461,7 +461,7 @@ MFEM_USE_UMPIRE = YES/NO
  MFEM_USE_BENCHMARK = YES/NO
  Enables support for Google Benchmark, a library to support the benchmarking
  - of functions, similar to unit-tests.
  + of functions, in the tests/benchmarks directory.
  MFEM_USE_HIOP = YES/NO
  Enable the usage of HiOp (https://github.com/LLNL/hiop) in MFEM. HiOp is an
  @@ -520,9 +520,6 @@ MFEM_USE_CALIPER = YES/NO
  profiling at runtime with Caliper's configuration API. Alternatively, one
  can configure Caliper through environment variables or config files.
  -MFEM_USE_BENCHMARK = YES/NO
  - Enables the google-benchmarks in the tests/benchmarks directory.
  -
  MFEM_USE_FMS = YES/NO
  Enables support for the FMS library which consists of the DataCollection
  sub-class mfem::FMSDataCollection for I/O in FMS formats, see the header file
  