Use preferred capitalization of "Slurm" (#41109)

https://slurm.schedmd.com/faq.html#acronym

lib/spack/docs/packaging_guide.rst

@@ -2337,7 +2337,7 @@ window while a batch job is running ``spack install`` on the same or
 overlapping dependencies without any process trying to re-do the work of
 another.
 
-For example, if you are using SLURM, you could launch an installation
+For example, if you are using Slurm, you could launch an installation
 of ``mpich`` using the following command:
 
 .. code-block:: console

lib/spack/spack/test/llnl/util/lock.py

@@ -18,7 +18,7 @@
     mpirun -n 7 spack test lock
 
 And it will test locking correctness among MPI processes.  Ideally, you
-want the MPI processes to span across multiple nodes, so, e.g., for SLURM
+want the MPI processes to span across multiple nodes, so, e.g., for Slurm
 you might do this::
 
     srun -N 7 -n 7 -m cyclic spack test lock

var/spack/repos/builtin/packages/mpich/package.py

@@ -55,7 +55,7 @@ class Mpich(AutotoolsPackage, CudaPackage, ROCmPackage):
     variant("hydra", default=True, description="Build the hydra process manager")
     variant("romio", default=True, description="Enable ROMIO MPI I/O implementation")
     variant("verbs", default=False, description="Build support for OpenFabrics verbs.")
-    variant("slurm", default=False, description="Enable SLURM support")
+    variant("slurm", default=False, description="Enable Slurm support")
     variant("wrapperrpath", default=True, description="Enable wrapper rpath")
     variant(
         "pmi",

var/spack/repos/builtin/packages/openmpi/package.py

@@ -595,7 +595,7 @@ class Openmpi(AutotoolsPackage, CudaPackage):
     conflicts(
         "schedulers=slurm ~pmi",
         when="@1.5.4",
-        msg="+pmi is required for openmpi to work with SLURM.",
+        msg="+pmi is required for openmpi to work with Slurm.",
     )
     conflicts(
         "schedulers=loadleveler",

var/spack/repos/builtin/packages/slurm-drmaa/package.py

@@ -10,7 +10,7 @@ class SlurmDrmaa(AutotoolsPackage):
     """
     DRMAA for Slurm is an implementation of Open Grid Forum DRMAA 1.0 (Distributed
     Resource Management Application API) specification for submission and control of
-    jobs to SLURM.  Using DRMAA, grid applications builders, portal developers and
+    jobs to Slurm.  Using DRMAA, grid applications builders, portal developers and
     ISVs can use the same high-level API to link their software with different
     cluster/resource management systems.
     """