Update vulnerabilities search url

Signed-off-by: Keshav Priyadarshi <git@keshav.space>

Author: keshav-space

docs/source/user-interface.rst

@@ -15,11 +15,11 @@ package URL or purl prefix fragment such as
 
 The search by packages is available at the following URL:
 
-    `https://public.vulnerablecode.io/packages/search <https://public.vulnerablecode.io/packages/search>`_
+    `https://public.vulnerablecode.io/packages/search/ <https://public.vulnerablecode.io/packages/search/>`_
 
 How to search by packages:
 
-    1. Go to the URL: `https://public.vulnerablecode.io/packages/search <https://public.vulnerablecode.io/packages/search>`_
+    1. Go to the URL: `https://public.vulnerablecode.io/packages/search/ <https://public.vulnerablecode.io/packages/search/>`_
     2. Enter the package URL or purl prefix fragment such as ``pkg:pypi``
        or by package name in the search box.
     3. Click on the search button.