[gimp-web] Correct GIMP bug url, was pointing to gimp-web

[Michael Schumacher <schumaml src gnome org>]

commit 3d20a2873b30787be3a94b8a147247a7e12b0a53
Author: Michael Schumacher <schumaml gmx de>
Date:   Mon Jun 1 01:46:22 2020 +0200

    Correct GIMP bug url, was pointing to gimp-web
    
    Also update the hints for mirrors.

 content/about/webmasters.md | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)
---
diff --git a/content/about/webmasters.md b/content/about/webmasters.md
index f5e4358e..a8ef8015 100644
--- a/content/about/webmasters.md
+++ b/content/about/webmasters.md
@@ -9,7 +9,7 @@ status: hidden
 
 This site is maintained by a team of volunteers who are constantly trying to improve it. We are all GIMP 
users and some of us are also GIMP developers. If you have a question or a comment about GIMP, we will do our 
best to help you. However, we get a _lot_ of mail and we may not be able to answer all queries. The best way 
to get support is to post your questions and comments to one of the [mailing lists](/mail_lists.html) or [IRC 
channels](/irc.html), or to the GIMP newsgroup (comp.graphics.apps.gimp).
 
-If you have a problem with GIMP and you think that you have found a bug or if you would like to suggest a 
new feature, you can also take a look at our [bugs page](/bugs/). Your problem may have been reported or 
solved already, so please [search and browse](https://gitlab.gnome.org/Infrastructure/gimp-web/issues) for 
existing reports first.
+If you have a problem with GIMP and you think that you have found a bug or if you would like to suggest a 
new feature, you can also take a look at our [bugs page](/bugs/). Your problem may have been reported or 
solved already, so please [search and browse](https://gitlab.gnome.org/GNOME/gimp/issues) for existing 
reports first.
 
 If you have the feeling that your report will require (longer) discussion - this is true for most feature 
requests - then you should bring this topic up on the gimp-developer mailing list first.
 
@@ -27,12 +27,15 @@ You can also use GNOME Gitlab to [notify us](https://gitlab.gnome.org/Infrastruc
 
 Some hints on the server setup:
 
-*   Please try to offer HTTP, FTP and rsync access
+*   Please try to offer at least HTTPS access, and if possible also FTP and rsync access
 *   Check that all README files are present
-*   Check that README, MIRRORS and \*.md5 are sent as text/plain
+*   Check that README, MIRRORS, \*.md5, SHA256SUMS and SHA512SUMS files are sent as text/plain
+*   Configure directory listings to use version sort
 
 The size of the data as seen on https://download.gimp.org/pub/ is currently around 4.1 GiB, with gimp and 
gtk subdirectories amounting to about 3.4 GiB. New releases are uploaded some time before the announcement is 
made, so syncing every few days should be sufficient.
 
+You will see lots of partial requests for pieces of files, especially after new releases - this is mostly 
torrent clients picking up pieces from web seeds.
+
 
 ## Last resort