reflect: better document the tri-state for TryRecv
R=rsc, iant
CC=golang-codereviews
https://golang.org/cl/52360043
diff --git a/src/pkg/reflect/value.go b/src/pkg/reflect/value.go
index 89d3292..30b5e2a 100644
--- a/src/pkg/reflect/value.go
+++ b/src/pkg/reflect/value.go
@@ -1832,9 +1832,9 @@
// TryRecv attempts to receive a value from the channel v but will not block.
// It panics if v's Kind is not Chan.
-// If the receive cannot finish without blocking, x is the zero Value.
-// The boolean ok is true if the value x corresponds to a send
-// on the channel, false if it is a zero value received because the channel is closed.
+// If the receive delivers a value, x is the transferred value and ok is true.
+// If the receive cannot finish without blocking, x is the zero Value and ok is false.
+// If the channel is closed, x is the zero value for the channel's element type and ok is false.
func (v Value) TryRecv() (x Value, ok bool) {
v.mustBe(Chan)
v.mustBeExported()
