Fixed extraneous paragraph in doc/src/fix_langevin.tct

Results of simulations using the {gjf} option with both {vfull} and {vhalf} compared to

other available thermostats are shown in the LAMMPS directory: examples/gjf.

As an example of why to use the {gjf} keyword, for molecules containing C-H

bonds, configurational properties generated with dt = 2.5 fs and tdamp

= 100 fs are indistinguishable from dt = 0.5 fs.  Because the velocity

distribution systematically decreases with increasing timestep, the

method should not be used to generate properties that depend on the

velocity distribution, such as the velocity auto-correlation function

(VACF). In this example, the velocity distribution at dt = 2.5fs

generates an average temperature of 220 K, instead of 300 K.

:line

Styles with a {gpu}, {intel}, {kk}, {omp}, or {opt} suffix are