chore: remove URL image mention from label

For adding images via URL, use fallback feature

includes/views/import-metabox-edit.php

@@ -499,7 +499,7 @@ class="form-control fz-textarea-tagify"><?php echo esc_html( feedzy_custom_tag_e
 												</div>
 												<div class="help-text">
 													<?php
-														esc_html_e( 'You can use the magic tags, your own URL or leave it empty.', 'feedzy-rss-feeds' );
+														esc_html_e( 'You can use the magic tags, or leave it empty.', 'feedzy-rss-feeds' );
 													?>
 												</div>
 											</div>