[temp.over.link] Change leading letter in comments in example to lowercase.

Fixes NB JP 6 (C++17 DIS)

Author: zygoloid

source/templates.tex

@@ -3614,15 +3614,15 @@
 equivalent and would cause a program to be ill-formed:
 
 \begin{codeblock}
-// Guaranteed to be the same
+// guaranteed to be the same
 template <int I> void f(A<I>, A<I+10>);
 template <int I> void f(A<I>, A<I+10>);
 
-// Guaranteed to be different
+// guaranteed to be different
 template <int I> void f(A<I>, A<I+10>);
 template <int I> void f(A<I>, A<I+11>);
 
-// Ill-formed, no diagnostic required
+// ill-formed, no diagnostic required
 template <int I> void f(A<I>, A<I+10>);
 template <int I> void f(A<I>, A<I+1+2+3+4>);
 \end{codeblock}