[re.tokiter.incr] Replace the uses of "local variable"

... with "variable with automatic storage duration"

Author: frederick-vs-ja

source/text.tex

@@ -12766,9 +12766,8 @@
 \begin{itemdescr}
 \pnum
 \effects
-Constructs a local variable \tcode{prev} of
-type \tcode{position_iterator}, initialized with the value
-of \tcode{position}.
+Constructs a variable \tcode{prev} of type \tcode{position_iterator}
+with automatic storage duration, initialized with the value of \tcode{position}.
 
 \pnum
 If \tcode{*this} is a suffix iterator, sets \tcode{*this} to an