GH-383 - Update runtime.adoc by completing intro paragraph.

Original pull request: GH-384.

Author: nikimicallef

src/docs/antora/modules/ROOT/pages/runtime.adoc

@@ -2,7 +2,7 @@
 = Spring Modulith Runtime Support
 
 The functionality described in previous chapters have all used the application module arrangement in either testing scenarios for verification and documentation purposes or were general support functionality that help to loosely couple modules but did not work with the application module structure directly.
-In this section we are going to describe Spring Modulith's support for
+In this section we are going to describe Spring Modulith's support for module initialization at application runtime.
 
 [[setup]]
 == Setting up Runtime Support for Application Modules