[iterators] Remove inconsistent, excessive whitespace around punctuators

Author: tkoeppe

source/iterators.tex

@@ -1206,7 +1206,7 @@
     constexpr reverse_iterator& operator+=(difference_type n);
     constexpr reverse_iterator  operator- (difference_type n) const;
     constexpr reverse_iterator& operator-=(difference_type n);
-    constexpr @\unspec@ operator[](difference_type n) const;
+    constexpr @\unspecnc@ operator[](difference_type n) const;
   protected:
     Iterator current;
   };
@@ -1265,11 +1265,11 @@
 \tcode{operator-}~(\ref{reverse.iter.op-}),
 \tcode{operator+=}~(\ref{reverse.iter.op+=}),
 \tcode{operator-=}~(\ref{reverse.iter.op-=}),
-\tcode{operator\,[]}~(\ref{reverse.iter.opindex}),
+\tcode{operator[]}~(\ref{reverse.iter.opindex}),
 or the non-member operators
 \tcode{operator<}~(\ref{reverse.iter.op<}),
 \tcode{operator>}~(\ref{reverse.iter.op>}),\\
-\tcode{operator\,<=}~(\ref{reverse.iter.op<=}),
+\tcode{operator<=}~(\ref{reverse.iter.op<=}),
 \tcode{operator>=}~(\ref{reverse.iter.op>=}),
 \tcode{operator-}~(\ref{reverse.iter.opdiff})
 or