Suppress checkstyle violations in doc code

This has been contributed to spring-javaformat, see https://github
.com/spring-io/spring-javaformat/pull/316.

See spring-projectsgh-25110

Author: mhalbritter

src/checkstyle/checkstyle-suppressions.xml

@@ -20,6 +20,7 @@
 	<suppress files="[\\/]spring-boot-docs[\\/]" checks="JavadocType|JavadocVariable" />
 	<suppress files="[\\/]spring-boot-docs[\\/]" checks="SpringJavadoc" message="\@since" />
 	<suppress files="[\\/]spring-boot-docs[\\/].*jooq" checks="AvoidStaticImport" />
+	<suppress files="[\\/]spring-boot-docs[\\/].*MyRoutingConfiguration\.java" checks="AvoidStaticImport"/>
 	<suppress files="[\\/]spring-boot-smoke-tests[\\/]" checks="JavadocType" />
 	<suppress files="[\\/]spring-boot-smoke-tests[\\/]" checks="ImportControl" />
 	<suppress files="[\\/]spring-boot-smoke-tests[\\/]" id="mainCodeIllegalImportCheck" />