Merge pull request #1133 from lammps/doc-adjust

doc/Makefile

doc/src/Commands_bond.txt

doc/src/Commands_compute.txt

doc/src/Commands_fix.txt

doc/src/Commands_pair.txt

doc/src/Errors_messages.txt

doc/src/Errors_warnings.txt

doc/src/Install_linux.txt

doc/src/Packages_details.txt

doc/src/Packages_user.txt

doc/src/angle_sdk.txt

doc/src/compute_msd_chunk.txt

doc/src/compute_ptm_atom.txt

doc/src/compute_smd_triangle_vertices.txt

doc/src/compute_spin.txt

doc/src/computes.txt

doc/src/dihedral_nharmonic.txt

doc/src/dump_image.txt

doc/src/fix_msst.txt

doc/src/fix_nve_awpmd.txt