Add more package lines for the docs

core/compress/gzip/doc.odin

@@ -1,3 +1,5 @@
+// package gzip implements a small GZIP implementation as an example.
+package compress_gzip
 /*
 	Copyright 2021 Jeroen van Rijn <nom@duclavier.com>.
 	Made available under Odin's BSD-3 license.
@@ -86,5 +88,4 @@ Example:
 		}
 		bytes.buffer_destroy(&buf)
 	}
-*/
-package compress_gzip
+*/