Merge #2185

2185: Update reverse.rst r=mergify[bot] a=audioscavenger

updated the external proxy location pattern and added a note: do not add a ``/`` at the end

## What type of PR?

documentation

## What does this PR do?

### Related issue(s)
- did not bother to create an issue

## Prerequisites
Before we can consider review and merge, please make sure the following list is done and checked.
If an entry in not applicable, you can check it or remove it from the list.

- [ ] i would like to add [changelog](https://mailu.io/master/contributors/workflow.html#changelog) entry file but i don't know how


Co-authored-by: Eric <dev@derewonko.com>

docs/reverse.rst

@@ -66,7 +66,7 @@ Because the admin interface is served as ``/admin``, the Webmail as ``/webmail``
   server {
     # [...] here goes your standard configuration
 
-    location ~ ^/(admin|sso|static|webdav|webmail)/ {
+    location ~ ^/(admin|sso|static|webdav|webmail) {
       proxy_set_header Host $host;
       proxy_set_header X-Real-IP $remote_addr
       proxy_pass https://localhost:8443;     
@@ -89,6 +89,8 @@ Because the admin interface is served as ``/admin``, the Webmail as ``/webmail``
     }
   }
 
+.. note:: Please don’t add a ``/`` at the end of the location pattern or all your redirects will fail with 404 because the ``/`` would be missing, and you would have to add it manually to move on
+
 .. code-block:: docker
   
   #mailu.env file

towncrier/newsfragments/2185.doc

@@ -0,0 +1 @@
+remove the / in the location to avoid http 404