Unfortunately the IBM pages for Fortran XL are still very highly ranked, and when clicked just show an internal error that the page no longer exists.
I know almost nothing about how to affect google search rankings, but it’s a definite issue when discoverability is so low. For most intrinsics you can google “gfortran NAME” and get the documentation page. Some things like open read and write I haven’t found a consistent way to get anything useful from gfortran. For those I google “intel fortran open” for good results.
The major issue with both of these is that one has to know ahead of time how to finesse google on the topic to get current day results and not some FORTRAN 77 reference.