platform/x86/intel/ifs: Update documentation with image download path

The documentation previously listed the path to download In Field Scan
(IFS) test images as "TBD".

Update the documentation to include the correct image download
location. Also move the download link to the appropriate section within
the documentation.

Reported-by: Anisse Astier <anisse@astier.eu>
Signed-off-by: Jithu Joseph <jithu.joseph@intel.com>
Link: https://lore.kernel.org/r/20250131205315.1585663-1-jithu.joseph@intel.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

Author: jithu83

drivers/platform/x86/intel/ifs/ifs.h

@@ -23,12 +23,14 @@
  * IFS Image
  * ---------
  *
- * Intel provides a firmware file containing the scan tests via
- * github [#f1]_.  Similar to microcode there is a separate file for each
+ * Intel provides firmware files containing the scan tests via the webpage [#f1]_.
+ * Look under "In-Field Scan Test Images Download" section towards the
+ * end of the page. Similar to microcode, there are separate files for each
  * family-model-stepping. IFS Images are not applicable for some test types.
  * Wherever applicable the sysfs directory would provide a "current_batch" file
  * (see below) for loading the image.
  *
+ * .. [#f1] https://intel.com/InFieldScan
  *
  * IFS Image Loading
  * -----------------
@@ -125,9 +127,6 @@
  * 2) Hardware allows for some number of cores to be tested in parallel.
  * The driver does not make use of this, it only tests one core at a time.
  *
- * .. [#f1] https://github.com/intel/TBD
- *
- *
  * Structural Based Functional Test at Field (SBAF):
  * -------------------------------------------------
  *