gromacs: support version 2024.4 (spack#47900)

And fix help formatting

Author: al42and

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

@@ -52,6 +52,7 @@ class Gromacs(CMakePackage, CudaPackage):
     # 2025 is supported.
     version("main", branch="main")
     version("master", branch="main", deprecated=True)
+    version("2024.4", sha256="ac618ece2e58afa86b536c5a2c4fcb937f0760318f12d18f10346b6bdebd86a8")
     version("2024.3", sha256="bbda056ee59390be7d58d84c13a9ec0d4e3635617adf2eb747034922cba1f029")
     version("2024.2", sha256="802a7e335f2e895770f57b159e4ec368ebb0ff2ce6daccf706c6e8025c36852b")
     version("2024.1", sha256="937d8f12a36fffbf2af7add71adbb5aa5c5537892d46c9a76afbecab1aa0aac7")
@@ -476,7 +477,7 @@ class Gromacs(CMakePackage, CudaPackage):
     variant(
         "intel_provided_gcc",
         default=False,
-        description="Use this if Intel compiler is installed through spack."
+        description="Use this if Intel compiler is installed through spack. "
         + "The g++ location is written to icp{c,x}.cfg",
     )