use Hyper-Threading consistently

doc/src/Speed_kokkos.txt

@@ -93,12 +93,12 @@ The "t Nt" option specifies how many OpenMP threads per MPI task to
 use with a node. The default is Nt = 1, which is MPI-only mode.  Note
 that the product of MPI tasks * OpenMP threads/task should not exceed
 the physical number of cores (on a node), otherwise performance will
-suffer. If hyperthreading is enabled, then the product of MPI tasks *
-OpenMP threads/task should not exceed the physical number of cores *
-hardware threads.  The "-k on" switch also issues a "package kokkos"
-command (with no additional arguments) which sets various KOKKOS
-options to default values, as discussed on the "package"_package.html
-command doc page.
+suffer. If Hyper-Threading (HT) is enabled, then the product of MPI
+tasks * OpenMP threads/task should not exceed the physical number of
+cores * hardware threads.  The "-k on" switch also issues a
+"package kokkos" command (with no additional arguments) which sets
+various KOKKOS options to default values, as discussed on the
+"package"_package.html command doc page.
 
 The "-sf kk" "command-line switch"_Run_options.html will automatically
 append the "/kk" suffix to styles that support it.  In this manner no
@@ -149,7 +149,7 @@ Intel Knight's Landing (KNL) Xeon Phi:
 
 KNL Intel Phi chips have 68 physical cores. Typically 1 to 4 cores are
 reserved for the OS, and only 64 or 66 cores are used. Each core has 4
-hyperthreads,so there are effectively N = 256 (4*64) or N = 264 (4*66)
+Hyper-Threads,so there are effectively N = 256 (4*64) or N = 264 (4*66)
 cores to run on. The product of MPI tasks * OpenMP threads/task should
 not exceed this limit, otherwise performance will suffer. Note that
 with the KOKKOS package you do not need to specify how many KNLs there

doc/src/package.txt

@@ -363,7 +363,7 @@ specified with the OMP_NUM_THREADS environment variable or the {omp}
 keyword). The extra thread is dedicated for performing part of the
 "PPPM solver"_kspace_style.html computations and communications. This
 can improve parallel performance on processors supporting
-Simultaneous Multithreading (SMT) such as Hyperthreading on Intel
+Simultaneous Multithreading (SMT) such as Hyper-Threading (HT) on Intel
 processors. In this mode, one additional thread is generated per MPI
 process. LAMMPS will generate a warning in the case that more threads
 are used than available in SMT hardware on a node. If the PPPM solver