[ranges] Indented \end{codeblock} causes trailing empty line

[Eelis]

Notice the trailing empty line after the codeblock:

This is caused by the fact that the \end{codeblock} is indented:

draft/source/ranges.tex

Lines 485 to 487 in 8166369

	\begin{codeblock}
	template<class T> void rbegin(T&&) = delete;
	\end{codeblock}

[ranges] is the only chapter that has indented \end{codeblock}s:

ranges.tex:354:  \end{codeblock}
ranges.tex:394:  \end{codeblock}
ranges.tex:401:  \end{codeblock}
ranges.tex:407:  \end{codeblock}
ranges.tex:487:  \end{codeblock}
ranges.tex:528:  \end{codeblock}
ranges.tex:535:  \end{codeblock}
ranges.tex:540:  \end{codeblock}
ranges.tex:632:    \end{codeblock}

It might be a good idea to include a rule about this in the specification guidelines wiki.