[clang-tidy] Fix syntax error in modernize-use-emplace.rst

[mboehme]

Summary

The missing newline after the ".. code:: c++" was causing a compile error when producing the documentation

[Eugene.Zelenko]

List of Clang-tidy checks was not updated for long time (I still don't see modernize-use-emplace). May be documentation contains other mistakes?

[hokein]

Someone fixed this error r275254 several hours ago.

List of Clang-tidy checks was not updated for long time (I still don't see modernize-use-emplace). May be documentation contains other mistakes?

Are the clang-tools-extra documents updated automatically or manually? I see the documents get updated now (modernize-use-emplace check is in there).

[mboehme]

Good to hear -- abandoning this patch then.

docs/clang-tidy/checks/modernize-use-emplace.rst

.. code:: c++
 
   std::vector<boost::optional<std::string> > v;
   v.emplace_back("abc");
 
 
 In this case the calls of ``push_back`` won't be replaced.
 
 .. code:: c++
+
   std::vector<std::unique_ptr<int> > v;
   v.push_back(new int(5));
   auto *ptr = int;
   v.push_back(ptr);
 
 This is because replacing it with ``emplace_back`` could cause a leak of this
 pointer if ``emplace_back`` would throw exception before emplacement
 (e.g. not enough memory to add new element).