Moved fix_nvk to USER-MISC, updated documentation to reflect move

doc/src/Section_commands.txt

@@ -603,7 +603,6 @@ USER-INTEL, k = KOKKOS, o = USER-OMP, t = OPT.
 "nve/noforce"_fix_nve_noforce.html,
 "nve/sphere (o)"_fix_nve_sphere.html,
 "nve/tri"_fix_nve_tri.html,
-"nvk"_fix_nvk.html,
 "nvt (iko)"_fix_nh.html,
 "nvt/asphere (o)"_fix_nvt_asphere.html,
 "nvt/body"_fix_nvt_body.html,
@@ -703,6 +702,7 @@ package"_Section_start.html#start_3.
 "manifoldforce"_fix_manifoldforce.html,
 "meso/stationary"_fix_meso_stationary.html,
 "nve/manifold/rattle"_fix_nve_manifold_rattle.html,
+"nvk"_fix_nvk.html,
 "nvt/manifold/rattle"_fix_nvt_manifold_rattle.html,
 "nph/eff"_fix_nh_eff.html,
 "npt/eff"_fix_nh_eff.html,

doc/src/fix.txt

@@ -217,7 +217,6 @@ of "this page"_Section_commands.html#cmd_5.
 "nve/noforce"_fix_nve_noforce.html - NVE without forces (v only)
 "nve/sphere"_fix_nve_sphere.html - NVE for spherical particles
 "nve/tri"_fix_nve_tri.html - NVE for triangles
-"nvk"_fix_nvk.html - constant kinetic energy time integration
 "nvt"_fix_nh.html - constant NVT time integration via Nose/Hoover
 "nvt/asphere"_fix_nvt_asphere.html - NVT for aspherical particles
 "nvt/body"_fix_nve_body.html - NVT for body particles

doc/src/fix_nvk.txt

@@ -54,6 +54,10 @@ the simulation box. Therefore, the group must be set to all.
 
 This fix has not yet been implemented to work with the RESPA integrator.
 
+This fix is part of the USER-MISC package.  It is only enabled if LAMMPS
+was built with that package.  See the "Making
+LAMMPS"_Section_start.html#start_3 section for more info.
+
 [Related commands:] none
 
 [Default:] none