Merge pull request #145 from tnull/patch-3

Update `architecture.md`

Author: Conor Okus

docs/overview/architecture.md

@@ -1,10 +1,10 @@
 ## LDK Architecture
 ![LDK Architecture](../assets/ldk-architecture.svg)
 
-LDK's core components are shown in the center box labeled `lightning`. Boxes
-with dotted borders are LDK's batteries — these must be configured with either
+LDK's core components are shown in the center box labeled `lightning`. The boxes
+with dotted borders are LDK's modules — these must be configured with either
 off-the-shelf or custom implementations that you provide.
 
-EventHandler in the diagram is not so much a necessary LDK battery, but instead
+`EventHandler` in the diagram is not so much a necessary LDK module, but instead
 refers to the fact that LDK generates events that the user should handle (e.g.
-the `PaymentReceived` event).
+the `PaymentReceived` event).