MINOR: examples: update haproxy.spec to mention new docs

intro.txt and management.txt were added. haproxy-{en,fr}.txt were removed.
diff --git a/examples/haproxy.spec b/examples/haproxy.spec
index 9421bf4..c515704 100644
--- a/examples/haproxy.spec
+++ b/examples/haproxy.spec
@@ -67,7 +67,7 @@
 
 %files
 %defattr(-,root,root)
-%doc CHANGELOG README examples/*.cfg doc/haproxy-en.txt doc/haproxy-fr.txt doc/architecture.txt doc/configuration.txt doc/proxy-protocol.txt
+%doc CHANGELOG README examples/*.cfg doc/architecture.txt doc/configuration.txt doc/intro.txt doc/management.txt doc/proxy-protocol.txt
 %doc %{_mandir}/man1/%{name}.1*
 
 %attr(0755,root,root) %{_sbindir}/%{name}