Link algorithms policy doc page from policy development doc page

Author: rdimaio

docs/operator_policy_packages/policy_package_development.md

@@ -127,6 +127,8 @@ In all cases the names used to register the functions (e.g. `voname_extract_scop
 with the name of the virtual organisation that owns the policy package,
 to avoid naming conflicts on multi-VO Rucio installations.
 
+See [the Algorithms documentation page](operator_policy_packages/policy_package_algorithms.md) for more on developing algorithms.
+
 ### Permission and schema modules
 
 The `permission.py` and `schema.py` modules are optional; an experiment