templater: fix invalid reference of runsymbol in doctest

Oversight at da710c3df4dc. I was just lucky that this lambda function is
never evaluated.

mercurial/templater.py

@@ -402,7 +402,7 b' def _buildfuncargs(exp, context, curmeth'
     """Compile parsed tree of function arguments into list or dict of
     (func, data) pairs
 
-    >>> context = engine(lambda t: (runsymbol, t))
+    >>> context = engine(lambda t: (templateutil.runsymbol, t))
     >>> def fargs(expr, argspec):
     ...     x = _parseexpr(expr)
     ...     n = getsymbol(x[1])