Renamed NRHO preset

Author: AndreyAPopov

toolbox/+otp/+cr3bp/+presets/NRHO.m renamed to toolbox/+otp/+cr3bp/+presets/L2NRHO.m

@@ -1,12 +1,12 @@
-classdef NRHO < otp.cr3bp.CR3BPProblem
+classdef L2NRHO < otp.cr3bp.CR3BPProblem
  % This preset builds an $L_2$ halo orbit preset for the CR3BP based on
  % a table of reference initial conditions and periods. The table
  % contains $20$ entries, and thus there are $20$ different possible
  % orbits given by this preset. The table of $L_2$ halo orbits is given 
  % as Table A.1 on page 218 of :cite:p:`Spr21`.
 
  methods
- function obj = NRHO(varargin)
+ function obj = L2NRHO(varargin)
  % Create the NRHO CR3BP problem object.
  %
  % Parameters