[FIX] doc: add missing ">"

Unclosed tag

closes odoo/odoo#37689

Signed-off-by: Martin Trigaux (mat) <mat@odoo.com>

doc/reference/guidelines.rst

@@ -296,7 +296,7 @@ Use the following pattern :
   lowercase string briefly explaining the action. This is used only if
   multiple actions are declared for the model.
 * For window actions: suffix the action name by the specific view information
-  like :samp:`{<model_name>}_action_view_{<view_type}`.
+  like :samp:`{<model_name>}_action_view_{<view_type>}`.
 * For a group: :samp:`{<model_name>}_group_{<group_name>}` where *group_name*
   is the name of the group, generally 'user', 'manager', ...
 * For a rule: :samp:`{<model_name>}_rule_{<concerned_group>}` where