<numeric>: Synopsisスタイル修正 "namespace std {"

Author: akinomyoga

reference/numeric/accumulate.md

@@ -4,7 +4,7 @@
 * function template[meta id-type]
 
 ```cpp
-namespace std{
+namespace std {
   template <class InputIterator, class T>
   T accumulate(InputIterator first, InputIterator last, T init);           // (1) C++03
   template <class InputIterator, class T>

reference/numeric/exclusive_scan.md

@@ -5,7 +5,7 @@
 * cpp17[meta cpp]
 
 ```cpp
-namespace std{
+namespace std {
   template <class InputIterator, class OutputIterator, class T>
   OutputIterator
     exclusive_scan(InputIterator first,

reference/numeric/inclusive_scan.md

@@ -5,7 +5,7 @@
 * cpp17[meta cpp]
 
 ```cpp
-namespace std{
+namespace std {
   template <class InputIterator, class OutputIterator>
   OutputIterator
     inclusive_scan(InputIterator first,

reference/numeric/iota.md

@@ -5,7 +5,7 @@
 * cpp11[meta cpp]
 
 ```cpp
-namespace std{
+namespace std {
   template <class ForwardIterator, class T>
   void
     iota(ForwardIterator first, ForwardIterator last, T value); // (1) C++11

reference/numeric/reduce.md

@@ -5,7 +5,7 @@
 * cpp17[meta cpp]
 
 ```cpp
-namespace std{
+namespace std {
   template <class InputIterator>
   typename iterator_traits<InputIterator>::value_type
     reduce(InputIterator first, InputIterator last);         // (1) C++17

reference/numeric/transform_exclusive_scan.md

@@ -5,7 +5,7 @@
 * cpp17[meta cpp]
 
 ```cpp
-namespace std{
+namespace std {
   template <class InputIterator, class OutputIterator, class T,
             class BinaryOperation, class UnaryOperation>
   OutputIterator

reference/numeric/transform_inclusive_scan.md

@@ -5,7 +5,7 @@
 * cpp17[meta cpp]
 
 ```cpp
-namespace std{
+namespace std {
   template <class InputIterator, class OutputIterator,
             class BinaryOperation, class UnaryOperation>
   OutputIterator

reference/numeric/transform_reduce.md

@@ -5,7 +5,7 @@
 * cpp17[meta cpp]
 
 ```cpp
-namespace std{
+namespace std {
   template <class InputIterator1, class InputIterator2, class T>
   T transform_reduce(InputIterator1 first1,
                      InputIterator1 last1,