docs: add max-width properties

Author: dgarcia360

docs/customization/styles.mdx

@@ -62,6 +62,7 @@ The tables below lists all the available properties you can override:
 
 ```css
 :root {
+
     --feedback-modal-button-bg-color: var(--feedback-white-color);
     --feedback-modal-button-bg-color-active: var(--feedback-white-color);
     --feedback-modal-button-border-color: var(--feedback-light-color);
@@ -79,6 +80,8 @@ The tables below lists all the available properties you can override:
     --feedback-modal-button-text-color-active: var(--feedback-primary-color);
     --feedback-modal-close-bg-color: var(--feedback-white-color);
     --feedback-modal-close-color: var(--feedback-dark-color);
+    --feedback-modal-content-max-width: 600px;
+    --feedback-modal-content-sidebar-max-width: 300px;
     --feedback-modal-content-bg-color: var(--feedback-white-color);
     --feedback-modal-content-border-color: var(--feedback-light-color);
     --feedback-modal-content-border-radius: 8px;