Reduce warnings reported by Eclipse

Closes gh-41598

spring-boot-project/spring-boot-tools/spring-boot-loader-tools/src/main/java/org/springframework/boot/loader/tools/Packager.java

@@ -264,6 +264,12 @@ public abstract class Packager {
 		}
 	}
 
+	/**
+	 * Writes a signature file if necessary for the given {@code writtenLibraries}.
+	 * @param writtenLibraries the libraries
+	 * @param writer the writer to use to write the signature file if necessary
+	 * @throws IOException if a failure occurs when writing the signature file
+	 */
 	protected void writeSignatureFileIfNecessary(Map<String, Library> writtenLibraries, AbstractJarWriter writer)
 			throws IOException {
 	}