Update docs/blog/_posts/2019-12-20-21th-dotty-milestone-release.md

emphasise that semanticdb is in aid of Metals.

Author: bishabosha

docs/blog/_posts/2019-12-20-21th-dotty-milestone-release.md

@@ -11,8 +11,8 @@ Greetings and we wish you Merry Christmas 🎄!
 We are excited to announce 0.21.0-RC1 of Scala 3. In this version we add support
 for non-nullable reference types and a flow-sensitive analysis that work
 complementary. We present new syntax for given extensions, matches and pattern
-matching over quotes. We are also happy to announce that SemanticDB extraction
-is now supported!
+matching over quotes. We are also happy to announce that SemanticDB generation
+is now supported within the compiler, this will eventually enable Metals to support Dotty!
 
 # Feature Complete!
 
@@ -290,14 +290,12 @@ def rewrite(expr: Expr[Double])(given QuoteContext): Expr[Double] = {
 
 To learn more read our docs on [pattern matching over quotes](https://dotty.epfl.ch/docs/reference/metaprogramming/macros.html#pattern-matching-on-quoted-expressions).
 
-## Added support for SemanticDB extraction
+## Added support for SemanticDB file generation
 
-Scala 3 now offers support for SemanticDB extraction producing `.semanticdb`
-files. Users can use the `-Ysemanticdb` compiler flag to enable exporting
-SemanticDB files. Providing `-semanticdb-target` allows the user to select a
-separate target destination for the `META-INF` directory that stores SemanticDB
-files and `-sourceroot` to calculate a relative path for SemanticDB files within
-`META-INF`.
+As part of ongoing efforts to support Dotty in Metals, our latest release now offers support for generation
+of SemanticDB files, enabled with the `-Ysemanticdb` compiler flag.
+Providing `-semanticdb-target` allows the user to select a separate target destination for the `META-INF` directory (the
+root for `.semanticdb` files) and `-sourceroot` to calculate a relative path for SemanticDB files within `META-INF`.
 
 # Let us know what you think!