context: add docs to ExampleWithValue

Change-Id: I3a83c63f4db2e46fd96f373378a429896e93f9d1
Reviewed-on: https://go-review.googlesource.com/48861
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

diff --git a/src/context/example_test.go b/src/context/example_test.go
index b2c2aa921da3591a1a2cb63bd3b8a4bdc77b867c..2b28b577042d6a8d71074d75591f70106a91d793 100644 (file)
--- a/src/context/example_test.go
+++ b/src/context/example_test.go
@@ -93,6 +93,8 @@ func ExampleWithTimeout() {
        // context deadline exceeded
 }
 
+// This example demonstrates how a value can be passed to the context
+// and also how to retrieve it if it exists.
 func ExampleWithValue() {
        type favContextKey string