Ticket #1404: ch03_basic_syntax.patch

docs/book/pir/ch03_basic_syntax.

@@ -176 +176 @@
 PIR also has named variables; the C<.local>
 directive declares them. As with register variables, there are four valid types:
 C<int>, C<num>, C<string>, and C<pmc>. You I<must> declare named variables; 
-otherwise they behave exactly the same as register variables.
+once declared, they behave exactly the same as register variables.
 
 =begin PIR_FRAGMENT