doc: change "threads" to "goroutines"
R=golang-dev, minux.ma, rsc
CC=golang-dev
https://golang.org/cl/40510049
diff --git a/doc/go_faq.html b/doc/go_faq.html
index f65dff7..e292bc8 100644
--- a/doc/go_faq.html
+++ b/doc/go_faq.html
@@ -446,7 +446,7 @@
<p>
After long discussion it was decided that the typical use of maps did not require
-safe access from multiple threads, and in those cases where it did, the map was
+safe access from multiple goroutines, and in those cases where it did, the map was
probably part of some larger data structure or computation that was already
synchronized. Therefore requiring that all map operations grab a mutex would slow
down most programs and add safety to few. This was not an easy decision,
