fix: use version_stable+1 for latest picker label, not display_version

display_version reflects the current branch (e.g. '32' on stable32),
which is correct for titles and the picker button but wrong for the
'latest' picker entry which should always show the master dev version.

Signed-off-by: skjnldsv <skjnldsv@protonmail.com>

Author: skjnldsv

conf.py

@@ -101,7 +101,7 @@ def generateVersionsDocs(current_docs):
 		url = 'https://docs.nextcloud.com/server/%s/%s' % (str(v), current_docs)
 		versions_doc.append((v, url, str(v)))
 	versions_doc.append(('stable', 'https://docs.nextcloud.com/server/stable/%s' % current_docs, '%s (stable)' % version_stable))
-	versions_doc.append(('latest', 'https://docs.nextcloud.com/server/latest/%s' % current_docs, '%s (latest)' % display_version))
+	versions_doc.append(('latest', 'https://docs.nextcloud.com/server/latest/%s' % current_docs, '%s (latest)' % str(version_stable + 1)))
 	return versions_doc
 
 if version.isdigit():