feat: Add a section label in the documentation

doc/Coding.tex

@@ -626,7 +626,7 @@ \section{Enumerations}
 
 \input{autoEnumerationDefinitions}
 
-\section{Defined Constants}
+\section{Defined Constants}\label{sec:definedConstants}
 
 \glc\ defines numerous constants, including mathematical constants (e.g. $\pi$), physical constants (e.g. the speed of light), unit conversions (e.g. Angstroms to meters), and prefixes (e.g. ``kilo'', ``mega'', etc.). These should be used whenever a constant is needed in the code---it is bad practice to use the numerical value of a constant directly in the code\footnote{Both because it is prone to mistakes (the more times a numerical value is used directly, the more chances there are for typos and other errors), and because using a named constant makes it much easier to understand \emph{what} the code is doing and \emph{why}.}.