Update one last place for Compile -> Compiling

Author: DougGregor

swift-package-init-lib.md

@@ -18,7 +18,7 @@ RUN: %{FileCheck} --check-prefix CHECK-BUILD-LOG --input-file %t.build-log %s
 ```
 
 ```
-CHECK-BUILD-LOG: Compile Swift Module 'Project'
+CHECK-BUILD-LOG: Compiling Swift Module 'Project'
 ```
 
 ## Check the test log.