net/http: correct capitalization in cancelTimeBody comment

Change-Id: I7acda22c01c5350ebf5ddabb1c12af96d368de5d
GitHub-Last-Rev: 3e5c022
GitHub-Pull-Request: #47160
Reviewed-on: https://go-review.googlesource.com/c/go/+/334229
Reviewed-by: Ian Lance Taylor <[email protected]>
Trust: Cherry Mui <[email protected]>
Run-TryBot: Ian Lance Taylor <[email protected]>

Author: shota3506

src/net/http/client.go

@@ -951,7 +951,7 @@ func (c *Client) CloseIdleConnections() {
 }
 
 // cancelTimerBody is an io.ReadCloser that wraps rc with two features:
-// 1) on Read error or close, the stop func is called.
+// 1) On Read error or close, the stop func is called.
 // 2) On Read failure, if reqDidTimeout is true, the error is wrapped and
 //    marked as net.Error that hit its timeout.
 type cancelTimerBody struct {