Doc updates to batch context.

batch/exec_func/get_valid_exec_func.m

+% This function serves as a helper function by generating a list of
+% all valid batch context drivers.
+
 function cellstrexec = get_valid_exec_func()
     cellstrexec = {'ef_current_base'};
     [thisdir, ~, ~] = fileparts(which(mfilename()));

batch/exec_func/mfile_name_gen.m

+% This function serves as a helper function that offloads the
+% generation of the file names for given tasks submitted by batch context.
+
 function [ mfile_name ] = mfile_name_gen(mfile_name, datafname, histfname, job_name)
 
 if isempty(job_name) && isempty(mfile_name)