Merge pull request #1485 from ahus1/fix-blank-for-paypen

adding missing blank before opening brace in text

Author: marioidival

src/meta.md

@@ -6,7 +6,7 @@ everyone. These topics include:
 
 - [Documentation][doc]: Generate library documentation for users via the included
   `rustdoc`.
-- [Playpen][playpen]: Integrate the Rust Playpen(also known as the Rust Playground) in your documentation.
+- [Playpen][playpen]: Integrate the Rust Playpen (also known as the Rust Playground) in your documentation.
 
 [doc]: meta/doc.md
 [playpen]: meta/playpen.md