Add missing package target in the package help page

CRAN check returns the following message:

Version: 0.1.3   
Check: Rd cross-references   
Result: NOTE   
  Found the following Rd file(s) with Rd \link{} targets missing package   
  anchors:   
    airGRdatassim.Rd: CreateCalibOptions   
  Please provide package anchors for all Rd \link{} targets not in the   
  package itself and the base packages.