collapse multiple empty lines into a single empty line

doc/src/fix_dpd_source.rst

@@ -9,7 +9,6 @@ fix tdpd/source command
 Syntax
 """"""
 
-
 .. parsed-literal::
 
    fix ID group-ID edpd/source keyword values ...
@@ -31,12 +30,9 @@ Syntax
          dLx,dLy,dLz = x,y,z side length of a cuboid domain (distance units)
          source = heat source or concentration source (flux units, see below)
 
-
-
 Examples
 """"""""
 
-
 .. parsed-literal::
 
    fix 1 all edpd/source sphere 0.0 0.0 0.0 5.0 0.01
@@ -66,10 +62,8 @@ spherical domain to apply the source flux to.
 If the *cuboid* keyword is used, the *cx,cy,cz,dLx,dLy,dLz* defines a
 cuboid domain to apply the source flux to.
 
-
 ----------
 
-
 **Restart, fix\_modify, output, run start/stop, minimize info:**
 
 No information about this fix is written to :doc:`binary restart files <restart>`.  None of the :doc:`fix_modify <fix_modify>` options
@@ -81,7 +75,6 @@ the :doc:`run <run>` command.  This fix is not invoked during :doc:`energy minim
 Restrictions
 """"""""""""
 
-
 This fix is part of the USER-MESODPD package. It is only enabled if
 LAMMPS was built with that package. See the :doc:`Build package <Build_package>` doc page for more info.
 
@@ -96,14 +89,10 @@ Related commands
 
 **Default:** none
 
-
 ----------
 
-
 .. _Li2014b:
 
-
-
 **(Li2014)** Z. Li, Y.-H. Tang, H. Lei, B. Caswell and G.E. Karniadakis,
 "Energy-conserving dissipative particle dynamics with
 temperature-dependent properties", J. Comput. Phys., 265: 113-127
@@ -111,8 +100,6 @@ temperature-dependent properties", J. Comput. Phys., 265: 113-127
 
 .. _Li2015b:
 
-
-
 **(Li2015)** Z. Li, A. Yazdani, A. Tartakovsky and G.E. Karniadakis,
 "Transport dissipative particle dynamics model for mesoscopic
 advection-diffusion-reaction problems", J. Chem. Phys., 143: 014101