[cover-wd] A more appropriate title, and better line spacing

Author: tkoeppe

source/cover-wd.tex

@@ -22,7 +22,7 @@
 \vspace{2.5cm}
 \begin{center}
 \textbf{\Huge
-Working Draft, Standard for Programming Language \Cpp{}}
+Working Draft\\[2ex]Programming Languages --- \Cpp{}}
 \end{center}
 \vfill
 \textbf{Note: this is an early draft. It's known to be incomplet and