IMD_TIME packet definitions modified (#68)

* Change: TIME packet definitions to clarify what `dt`, `step` mean

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Co-authored-by: Amruthesh Thirumalaiswamy <amruthesht@users.noreply.github.com>
Co-authored-by: Oliver Beckstein <orbeckst@gmail.com>
Co-authored-by: Matthias Heyden <mheyden1@asu.edu>

Author: 3 people

docs/source/protocol_v3.rst

@@ -419,8 +419,8 @@ time packets were previously specified for this session in the :ref:`session inf
       1 (int32) Number of time packets being sent
 
    Body:
-      <val> (float64) dt for the simulation
-      <val> (float64) Current time of the simulation
+      <val> (float64) Simulation integrator time step (dt)
+      <val> (float64) Current simulation time
       <val> (int64) Current integration step of the simulation
 
 .. versionadded:: 3