Add the module name as prefix of the blurb entry

Author: matrixise

Misc/NEWS.d/next/Library/2018-10-13-07-46-50.bpo-34969.Mfnhjb.rst

@@ -1,3 +1,3 @@
-Add --fast, --best on the gzip CLI, these parameters will be used for the
-fast compression method (quick) or the best method compress (slower, but
-smaller file). Also, change the default compression level to 6 (tradeoff).
+gzip: Add --fast, --best on the gzip CLI, these parameters will be used for the
+fast compression method (quick) or the best method compress (slower, but smaller
+file). Also, change the default compression level to 6 (tradeoff).