fixup! correct and update docs for defining generated functions

Author: vtjnash

doc/manual/metaprogramming.rst

@@ -1034,7 +1034,7 @@ These examples are hopefully helpful to illustrate how generated functions
 work, both in the definition end and at the call site; however, *don't
 copy them*, for the following reasons:
 
-* the ``foo`` function has side-effects (the call to `Core.println`), and it is undefined exactly when,
+* the ``foo`` function has side-effects (the call to ``Core.println``), and it is undefined exactly when,
   how often or how many times these side-effects will occur
 * the ``bar`` function solves a problem that is better solved with multiple
   dispatch - defining ``bar(x) = x`` and ``bar(x::Integer) = x ^ 2`` will do