content: change variable names in exported names article
It was confusing to some people that the article mentions Foo, FOO, and foo, when
the code example doesn't contain those names.
This replaces the foos with variations on Pi, which is the
constant used in the example.
Fixes golang/go#13045
Change-Id: I4ea572915dbd56a2fcbef6ea3691e1be397460cd
Reviewed-on: https://go-review.googlesource.com/18987
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
diff --git a/content/basics.article b/content/basics.article
index 8a10101..2fd5945 100644
--- a/content/basics.article
+++ b/content/basics.article
@@ -42,7 +42,7 @@
When importing a package, you can refer only to its exported names.
Any "unexported" names are not accessible from outside the package.
-`Foo` is an exported name, as is `FOO`. The name `foo` is not exported.
+`Pi` is an exported name, as is `PI`. The name `pi` is not exported.
Run the code. Notice the error message.
