Update docs/blog/_posts/2021-02-18-scala3-rc1.md

Co-authored-by: Dale Wijnand <[email protected]>

Author: anatoliykmetyuk

docs/blog/_posts/2021-02-18-scala3-rc1.md

@@ -33,7 +33,7 @@ import NumPy as np
 For the details and discussion, see [PR #11244](https://github.com/lampepfl/dotty/pull/11244). Read more about this change in the [documentation](https://dotty.epfl.ch/docs/reference/changed-features/imports.html).
 
 # Use `unitialized` for wildcard initializers
-An obscure use of _ occurs in var definitions:
+An obscure use of underscore (`_`) occurs in var definitions:
 
 ```scala
 var x: T = _