[temp.deduct.type] Remove excessive spacing in example (#6541)

Author: eisenwave

source/templates.tex

@@ -8225,11 +8225,11 @@
 that cause type deduction to fail:
 
 \begin{codeblock}
-template <class T, class U> void f(  T (*)( T, U, U )  );
+template <class T, class U> void f(T (*)(T, U, U));
 
-int g1( int, float, float);
-char g2( int, float, float);
-int g3( int, char, float);
+int g1(int, float, float);
+char g2(int, float, float);
+int g3(int, char, float);
 
 void r() {
   f(g1);            // OK, \tcode{T} is \tcode{int} and \tcode{U} is \tcode{float}