mention JIT

doc/src/Build_extras.rst

@@ -890,6 +890,11 @@ included in the LAMMPS source distribution in the ``lib/lepton`` folder.
       LAMMPS. No additional settings are normally needed besides
       ``-D PKG_LEPTON=yes``.
 
+      On x86 hardware the Lepton library will also include a just-in-time
+      compiler for faster execution.  This is auto detected but can
+      be explicitly disabled by setting ``-D LEPTON_ENABLE_JIT=no``
+      (or enabled by setting it to yes).
+
    .. tab:: Traditional make
 
       Before building LAMMPS, one must build the Lepton library in lib/lepton.

doc/src/Packages_details.rst

@@ -1401,9 +1401,8 @@ expressions.  This is a more lightweight and efficient alternative
 for evaluating custom potential function to an embedded Python
 interpreter as used in the :ref:`PYTHON package <PKG-PYTHON>`.
 On the other hand, since the potentials are evaluated form analytical
-expressions, they are more accurate than what can be done with
-:ref:`tabulated potentials <tabulate>`.  Using the runtime evaluation
-comes with a significant increase in runtime.
+expressions, they are more precise than what can be done with
+:ref:`tabulated potentials <tabulate>`.
 
 **Authors:** Axel Kohlmeyer (Temple U).  Lepton itself is developed
 by Peter Eastman at Stanford University.