updated feature overview to include instructions for AptByHash

docs/feature_overview.rst

@@ -153,6 +153,7 @@ AptByHash is a feature that mitigates commonplace 'Hash Sum Mismatch' errors dur
 It adds the checksum of the package metadata to the the packages' names.
 These files are then stored within a 'by-hash' directory within each release architecture in the specified debian repository.
 The client will then use the filename to identify the expected checksum and download a file whose name matches the checksum.
+This follows the specification outlined in `the Debian repository wiki <https://wiki.debian.org/DebianRepository/Format#indices_acquisition_via_hashsums_.28by-hash.29>`_.
 
 Please note that this feature is disabled by default and should be enabled prior to use.
 To do this, set `APT_BY_HASH = True` in `/pulp_deb/app/settings.py`.