OperatioView.js: fix rendering of Markdown (GFM) in description fields.

This removes substitution of \r\n, \r, \n to <br>, since the subsequent set of
renderGFM() gets confused by them. Furthermore, the marked module already does a
decent job of substituting \n with proper HTML (<p>, if I'm not mistaken).

src/main/javascript/view/OperationView.js

@@ -69,9 +69,6 @@ SwaggerUi.Views.OperationView = Backbone.View.extend({
       this.model.isReadOnly = true;
     }
     this.model.description = this.model.description || this.model.notes;
-    if (this.model.description) {
-      this.model.description = this.model.description.replace(/(?:\r\n|\r|\n)/g, '<br />');
-    }
     this.model.oauth = null;
     modelAuths = this.model.authorizations || this.model.security;
     if (modelAuths) {
@@ -626,4 +623,4 @@ SwaggerUi.Views.OperationView = Backbone.View.extend({
       Docs.expandOperation(elem);
     }
   }
-});
+});