Fix typo in generated code for plugins docs (#935)

Author: lupinitylabs

src/pages/docs/plugins.mdx

@@ -343,11 +343,11 @@ module.exports = {
 .tw-btn-blue:hover {
   background-color: #2779bd;
 }
-.tw-btn-blue {
+.tw-btn-red {
   background-color: #e3342f;
   color: #fff;
 }
-.tw-btn-blue:hover {
+.tw-btn-red:hover {
   background-color: #cc1f1a;
 }
 ```