Add upstream submission link and description for patch

os-autoinst.spec

@@ -46,6 +46,8 @@ License:        GPLv2+
 Group:          Development/System
 URL:            https://os-autoinst.github.io/openQA/
 Source0:        https://github.com/%{github_owner}/%{github_name}/archive/%{github_commit}/%{github_name}-%{github_commit}.tar.gz
+# https://github.com/os-autoinst/os-autoinst/pull/820
+# Fix build on Perl 5.26.0, where . is not in INC by default
 Patch0:         os-autoinst-Fix-building-on-Perl-without-dot-in-INC.patch
 
 BuildRequires:  autoconf