Update Fortran entry in file-scrapers.md

docs/file-scrapers.md

@@ -36,6 +36,18 @@ Go to https://www.erlang.org/downloads and download the HTML documentation file.
 
 ### GCC
 ### GNU Fortran
+Go to https://gcc.gnu.org/onlinedocs/ and download the HTML tarball of Fortran manual or run the following commands to download the tarball:
+
+```sh
+wget https://gcc.gnu.org/onlinedocs/gcc-<version>/gfortran-html.tar.gz
+```
+
+Then extract the content of the tarball and move it to the devdocs directory.
+
+```sh
+tar xf <tarball>
+mv <extracted_directory> path/to/devdocs/docs/gnu_fortran~<version>/
+```
 
 ## Gnuplot