15836: Mention forward slash substitution options in upgrade notes.

Arvados-DCO-1.1-Signed-off-by: Tom Clegg <tom@tomclegg.ca>

diff --git a/doc/admin/upgrading.html.textile.liquid b/doc/admin/upgrading.html.textile.liquid
index bc53ffa43949e5fc8156bccf4bf9c5acd32582e7..7f031d54dbc131b381a2830de125cae6db6d9c2d 100644 (file)
--- a/doc/admin/upgrading.html.textile.liquid
+++ b/doc/admin/upgrading.html.textile.liquid
@@ -30,7 +30,11 @@ Note to developers: Add new items at the top. Include the date, issue number, co
 TODO: extract this information based on git commit messages and generate changelogs / release notes automatically.
 {% endcomment %}
 
-h3(#master). development master (as of 2019-12-17)
+h3(#master). development master (as of 2020-01-16)
+
+h4. "/" prohibited in collection and project names
+
+(issue "#15836":https://dev.arvados.org/issues/15836) By default, Arvados now rejects new names containing the @/@ character when creating or renaming collections and projects. Previously, these names were permitted, but the resulting objects were invisible in the WebDAV "home" tree. If you prefer, you can restore the previous behavior, and optionally configure a substitution string to make the affected objects accessible via WebDAV. See @ForwardSlashNameSubstitution@ in the "configuration reference":config.html.
 
 h4. Migrating to centralized config.yml