docs: fix pagination doc style (#14451)

* fix document style bug

* Updates

* Update

examples/docs/en-US/pagination.md

@@ -42,7 +42,6 @@
   }
 
   .demo-pagination .last .demonstration + .el-pagination {
-    float: right;
     width: 70%;
     margin: 5px 20px 0 0;
   }

examples/docs/es/pagination.md

@@ -42,7 +42,6 @@
   }
 
   .demo-pagination .last .demonstration + .el-pagination {
-    float: right;
     width: 70%;
     margin: 5px 20px 0 0;
   }

examples/docs/fr-FR/pagination.md

@@ -42,7 +42,6 @@
   }
 
   .demo-pagination .last .demonstration + .el-pagination {
-    float: right;
     width: 70%;
     margin: 5px 20px 0 0;
   }

examples/docs/zh-CN/pagination.md

@@ -213,7 +213,6 @@
   }
 
   .demo-pagination .last .demonstration + .el-pagination {
-    float: right;
     width: 70%;
     margin: 5px 20px 0 0;
   }