small fixes and dependency updates

vendor/golang.org/x/net/webdav/if.go

@@ -24,7 +24,7 @@ type ifList struct {
 
 // parseIfHeader parses the "If: foo bar" HTTP header. The httpHeader string
 // should omit the "If:" prefix and have any "\r\n"s collapsed to a " ", as is
-// returned by req.Header.Get("If") for a http.Request req.
+// returned by req.Header.Get("If") for an http.Request req.
 func parseIfHeader(httpHeader string) (h ifHeader, ok bool) {
 	s := strings.TrimSpace(httpHeader)
 	switch tokenType, _, _ := lex(s); tokenType {

vendor/golang.org/x/net/webdav/webdav.go

@@ -655,7 +655,7 @@ func handlePropfindError(err error, info os.FileInfo) error {
 	// We need to be careful with other errors: there is no way to abort the xml stream
 	// part way through while returning a valid PROPFIND response. Returning only half
 	// the data would be misleading, but so would be returning results tainted by errors.
-	// The curent behaviour by returning an error here leads to the stream being aborted,
+	// The current behaviour by returning an error here leads to the stream being aborted,
 	// and the parent http server complaining about writing a spurious header. We should
 	// consider further enhancing this error handling to more gracefully fail, or perhaps
 	// buffer the entire response until we've walked the tree.