Fix formatting of lists in storage.md (#732)

content/docs/operating/storage.md

@@ -14,6 +14,7 @@ chunks are then stored on disk in one file per time series.
 
 This sections deals with the various configuration settings and issues you
 might run into. To dive deeper into the topic, check out the following talks:
+
 * [The Prometheus Time Series Database](https://www.youtube.com/watch?v=HbnGSNEjhUc).
 * [Configuring Prometheus for High Performance](https://www.youtube.com/watch?v=hPC60ldCGm8).
 
@@ -145,6 +146,7 @@ that situation._
 Open head chunks, chunks still waiting for persistence, and chunks being used
 in a query are not evictable. Thus, the reasons for the inability to evict
 enough chunks include the following:
+
 1. Queries that use too many chunks.
 2. Chunks are piling up waiting for persistence because the storage layer
    cannot keep up writing chunks.