net/http: sync Get and Head's documentation

Instead of ambiguously referring to "the Client's CheckRedirect
function" in Head, describe the default behavior like for Get as users
aren't expected to change DefaultClient.CheckRedirect.

While here, use consistent punctuation for the Get and Head Client
method documentation.

Change-Id: I9e7046c73b0d0bc4de002234924d9e7c59aceb41
Reviewed-on: https://go-review.googlesource.com/11362Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/net/http/client.go

@@ -283,7 +283,7 @@ func Get(url string) (resp *Response, err error) {
 
 // Get issues a GET to the specified URL. If the response is one of the
 // following redirect codes, Get follows the redirect after calling the
-// Client's CheckRedirect function.
+// Client's CheckRedirect function:
 //
 //    301 (Moved Permanently)
 //    302 (Found)
@@ -497,9 +497,9 @@ func (c *Client) PostForm(url string, data url.Values) (resp *Response, err erro
 	return c.Post(url, "application/x-www-form-urlencoded", strings.NewReader(data.Encode()))
 }
 
-// Head issues a HEAD to the specified URL.  If the response is one of the
-// following redirect codes, Head follows the redirect after calling the
-// Client's CheckRedirect function.
+// Head issues a HEAD to the specified URL.  If the response is one of
+// the following redirect codes, Head follows the redirect, up to a
+// maximum of 10 redirects:
 //
 //    301 (Moved Permanently)
 //    302 (Found)
@@ -513,7 +513,7 @@ func Head(url string) (resp *Response, err error) {
 
 // Head issues a HEAD to the specified URL.  If the response is one of the
 // following redirect codes, Head follows the redirect after calling the
-// Client's CheckRedirect function.
+// Client's CheckRedirect function:
 //
 //    301 (Moved Permanently)
 //    302 (Found)