Update Link for MODIS L2 Data

Update the link in the Raster Tools documentation for the MODIS Level 2 Cloud/Aerosol Products Tool (Section 4.2).

Old link: http://ladsweb.nascom.nasa.gov/data/search.html.

needs to be updated to:

https://ladsweb.nascom.nasa.gov/search/

Update Collection from 5 to 5.1 in section 4.2