Docfix

tarball/tarball.go

@@ -9,9 +9,9 @@ By default, the following decoders are supported using the Go standard library:
     .tar        plain tape archive
     .tar.bz2    bzip2 compressed tape archive
     .tar.gz     gzip compressed tape archive
-		.tar.xz     xzip compressed tape archive
+    .tar.xz     xzip compressed tape archive
     .tar.Z      lzw compressed tape archive
-		.tar.zz     zlib compressed tape archive
+    .tar.zz     zlib compressed tape archive
 
 */
 package tarball