[range.elements.iterator] remove stray semi-colon

Author: jwakely

source/ranges.tex

@@ -9085,7 +9085,7 @@
 
 \indexlibrarymember{operator+=}{elements_view::iterator}%
 \begin{itemdecl}
-constexpr @\exposid{iterator}@& operator+=(difference_type n);
+constexpr @\exposid{iterator}@& operator+=(difference_type n)
   requires @\libconcept{random_access_range}@<@\exposid{Base}@>;
 \end{itemdecl}