Added titles

docs/content/Firehose.md

@@ -1,6 +1,8 @@
 ---
 layout: doc_page
 ---
+
+# Druid Firehoses
 Firehoses describe the data stream source. They are pluggable and thus the configuration schema can and will vary based on the `type` of the firehose.
 
 | Field | Type | Description | Required |

docs/content/Plumber.md

@@ -1,6 +1,8 @@
 ---
 layout: doc_page
 ---
+
+# Druid Plumbers
 The Plumber is the thing that handles generated segments both while they are being generated and when they are "done". This is also technically a pluggable interface and there are multiple implementations, but there are a lot of details handled by the plumber such that it is expected that there will only be a few implementations and only more advanced third-parties will implement their own. 
 
 |Field|Type|Description|Required|