Polishing.

See #2263
Original pull request #2267

Author: michael-simons

src/main/asciidoc/preface.adoc

@@ -6,7 +6,7 @@ The Spring Data Commons project applies core Spring concepts to the development
 == Project Metadata
 
 * Version control: https://github.com/spring-projects/spring-data-commons
-* Bugtracker: ttps://github.com/spring-projects/spring-data-commons/issues
+* Bugtracker: https://github.com/spring-projects/spring-data-commons/issues
 * Release repository: https://repo.spring.io/libs-release
 * Milestone repository: https://repo.spring.io/libs-milestone
 * Snapshot repository: https://repo.spring.io/libs-snapshot