fix list comprehension discussion to use \keyword macro instead of simply
quoting keywords.
diff --git a/Doc/ref/ref5.tex b/Doc/ref/ref5.tex
index f6d3b9c..55725d1 100644
--- a/Doc/ref/ref5.tex
+++ b/Doc/ref/ref5.tex
@@ -164,10 +164,11 @@
When a comma-separated list of expressions is supplied, its elements are
evaluated from left to right and placed into the list object in that
order. When a list comprehension is supplied, it consists of a
-single expression followed by at least one "for" clause and zero or more
-"for" or "if" clauses. In this
+single expression followed by at least one \keyword{for} clause and zero or
+more \keyword{for} or \keyword{if} clauses. In this
case, the elements of the new list are those that would be produced
-by considering each of the "for" or "if" clauses a block, nesting from
+by considering each of the \keyword{for} or \keyword{if} clauses a block,
+nesting from
left to right, and evaluating the expression to produce a list element
each time the innermost block is reached.
\obindex{list}