added documentation for author tag management

Author: lsmith77

contributing/code/standards.rst

@@ -256,6 +256,11 @@ Documentation
 * Don't inline PHPDoc blocks, even when they contain just one tag (e.g. don't
   put ``/** {@inheritdoc} */`` in a single line).
 
+* When adding a new class or when making significant changes to an existing class,
+  an ``@author`` tag with personal contact information may be added, or expanded.
+  Please note it is possible to have the personal contact information updated or
+  removed per request to the doc:`core team </contributing/code/core_team>`.
+
 License
 ~~~~~~~