Fix copy/paste error in ParticleInterpolator docstrings (#4808)

The proposed changes:
- [x] fix a bug or incorrect behavior in AMReX
- [ ] add new capabilities to AMReX
- [ ] changes answers in the test suite to more than roundoff level
- [ ] are likely to significantly affect the results of downstream AMReX
users
- [x] include documentation in the code and/or rst files, if appropriate

Author: atmyers

Src/Particle/AMReX_ParticleInterpolators.H

@@ -31,8 +31,8 @@ struct Base
      *
      * \param p the particle to interpolate
      * \param arr the Array4 to interpolate to
-     * \param src_comp the particle component to start at
-     * \param dst_comp the mesh component to start at
+     * \param src_comp the particle component to start interpolating from
+     * \param dst_comp the mesh component to start writing to
      * \param num_comps the number of components to interpolate
      * \param f function for computing the particle quantity to interpolate
      *
@@ -93,8 +93,8 @@ struct Base
      *
      * \param p the particle to interpolate
      * \param arr the Array4 to interpolate to
-     * \param src_comp the particle component to start at
-     * \param dst_comp the mesh component to start at
+     * \param src_comp the mesh component to start interpolating from
+     * \param dst_comp the particle component to start writing to
      * \param num_comps the number of components to interpolate
      * \param f function for computing the particle quantity to interpolate
      * \param g function that updates the particle given the mesh value