rename feature flag to experimentalDefer

Author: lilianammmatos

src/__tests__/starWarsSchema.js

@@ -309,6 +309,6 @@ export const StarWarsSchema = new GraphQLSchema({
 export const StarWarsSchemaDeferStreamEnabled = new GraphQLSchema({
   query: queryType,
   types: [humanType, droidType],
-  experimentalDeferFragmentSpreads: true,
+  experimentalDefer: true,
   experimentalStream: true,
 });

src/execution/execute.js

@@ -546,7 +546,7 @@ export function collectFields(
           continue;
         }
 
-        const patchLabel = exeContext.schema.__experimentalDeferFragmentSpreads
+        const patchLabel = exeContext.schema.__experimentalDefer
           ? getDeferredNodeLabel(exeContext, selection)
           : '';
 
@@ -582,7 +582,7 @@ export function collectFields(
           continue;
         }
 
-        const patchLabel = exeContext.schema.__experimentalDeferFragmentSpreads
+        const patchLabel = exeContext.schema.__experimentalDefer
           ? getDeferredNodeLabel(exeContext, selection)
           : '';
 

src/type/schema.js

@@ -135,7 +135,7 @@ export class GraphQLSchema {
   // Used as a cache for validateSchema().
   __validationErrors: ?$ReadOnlyArray<GraphQLError>;
   // Referenced by execute()
-  __experimentalDeferFragmentSpreads: boolean;
+  __experimentalDefer: boolean;
   __experimentalStream: boolean;
 
   constructor(config: $ReadOnly<GraphQLSchemaConfig>): void {
@@ -164,8 +164,7 @@ export class GraphQLSchema {
     this.astNode = config.astNode;
     this.extensionASTNodes = config.extensionASTNodes;
 
-    this.__experimentalDeferFragmentSpreads =
-      config.experimentalDeferFragmentSpreads || false;
+    this.__experimentalDefer = config.experimentalDefer || false;
     this.__experimentalStream = config.experimentalStream || false;
     this._queryType = config.query;
     this._mutationType = config.mutation;
@@ -321,7 +320,7 @@ export type GraphQLSchemaValidationOptions = {|
    *
    * Default: false
    */
-  experimentalDeferFragmentSpreads?: boolean,
+  experimentalDefer?: boolean,
 
   /**
    *