pdf cleanup: fix links, remove internal references.
fix link in spec.

R=rsc
CC=go-dev
http://go/go-review/1017013
diff --git a/doc/GoCourseDay1.pdf b/doc/GoCourseDay1.pdf
index daa9985..bae12d2 100644
--- a/doc/GoCourseDay1.pdf
+++ b/doc/GoCourseDay1.pdf
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diff --git a/doc/GoCourseDay3.pdf b/doc/GoCourseDay3.pdf
index 91d723a..8f95806 100644
--- a/doc/GoCourseDay3.pdf
+++ b/doc/GoCourseDay3.pdf
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diff --git a/doc/go_spec.html b/doc/go_spec.html
index c1ab22b..aa98835 100644
--- a/doc/go_spec.html
+++ b/doc/go_spec.html
@@ -21,7 +21,7 @@
 
 <p>
 This is a reference manual for the Go programming language. For
-more information and other documents, see <a href="http://go/go">go/go</a>.
+more information and other documents, see <a href="http://golang.org/">http://golang.org</a>.
 </p>
 
 <p>
diff --git a/doc/go_talk-20091030.pdf b/doc/go_talk-20091030.pdf
index 5fe33ce..87ef93c 100644
--- a/doc/go_talk-20091030.pdf
+++ b/doc/go_talk-20091030.pdf
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