[class.temporary] Change "class type" to "type"

Missed edit from P2900R14.

Author: lprv

source/basic.tex

@@ -4718,7 +4718,7 @@
 \end{example}
 
 \pnum
-When an object of class type \tcode{X}
+When an object of type \tcode{X}
 is passed to or returned from a potentially-evaluated function call,
 if \tcode{X} is
 \begin{itemize}