paasio: Title as "PaaS I/O" instead of default "Paasio" (#1589)

petertseng · yawpitch · commit 3aa4c5d891d6 · 2019-09-26T13:18:54.000+01:00
Improves the copy only, so acceptable in light of #1560.
diff --git a/exercises/paasio/metadata.yml b/exercises/paasio/metadata.yml
@@ -1,4 +1,5 @@
 ---
+title: "PaaS I/O"
 blurb: "Report network IO statistics"
 source: "Brian Matsuo"
 source_url: "https://github.com/bmatsuo"
