Fix spelling errors in comments and documentation (#7492)

plugins/inputs/http_response/http_response.go

@@ -274,7 +274,7 @@ func (h *HTTPResponse) httpGather(u string) (map[string]interface{}, map[string]
 		// Get error details
 		netErr := setError(err, fields, tags)
 
-		// If recognize the returnded error, get out
+		// If recognize the returned error, get out
 		if netErr != nil {
 			return fields, tags, nil
 		}

plugins/inputs/http_response/http_response_test.go

@@ -722,7 +722,7 @@ func TestNetworkErrors(t *testing.T) {
 	absentTags := []string{"status_code"}
 	checkOutput(t, &acc, expectedFields, expectedTags, absentFields, absentTags)
 
-	// Connecton failed
+	// Connection failed
 	h = &HTTPResponse{
 		Log:             testutil.Logger{},
 		Address:         "https:/nonexistent.nonexistent", // Any non-routable IP works here