link the course slides from early in the tutorial

R=rsc
CC=go-dev
http://go/go-review/1026031

doc/go_tutorial.html

@@ -8,6 +8,10 @@ guide to the language; at the moment the document closest to that is the
 After you've read this tutorial, you might want to look at
 <a href='/doc/effective_go.html'>Effective Go</a>,
 which digs deeper into how the language is used.
+Also, slides from a 3-day course about Go are available:
+<a href='/doc/GoCourseDay1.pdf'>Day 1</a>,
+<a href='/doc/GoCourseDay2.pdf'>Day 2</a>,
+<a href='/doc/GoCourseDay3.pdf'>Day 3</a>.
 <p>
 The presentation here proceeds through a series of modest programs to illustrate
 key features of the language.  All the programs work (at time of writing) and are

doc/go_tutorial.txt

@@ -9,6 +9,10 @@ guide to the language; at the moment the document closest to that is the
 After you've read this tutorial, you might want to look at
 <a href='/doc/effective_go.html'>Effective Go</a>,
 which digs deeper into how the language is used.
+Also, slides from a 3-day course about Go are available:
+<a href='/doc/GoCourseDay1.pdf'>Day 1</a>,
+<a href='/doc/GoCourseDay2.pdf'>Day 2</a>,
+<a href='/doc/GoCourseDay3.pdf'>Day 3</a>.
 
 The presentation here proceeds through a series of modest programs to illustrate
 key features of the language.  All the programs work (at time of writing) and are