Remove references to introspectionQuery which is now deprecated.

Ref: graphql/graphql-js#2125

Author: abernix

packages/apollo-language-server/src/providers/schema/file.ts

@@ -70,7 +70,7 @@ export class FileSchemaProvider implements GraphQLSchemaProvider {
 
     const ext = extname(path);
 
-    // an actual introspectionQuery result, convert to DocumentNode
+    // an actual introspection query result, convert to DocumentNode
     if (ext === ".json") {
       const parsed = JSON.parse(result);
       const __schema = parsed.data

packages/apollo/src/Command.ts

@@ -73,7 +73,7 @@ export abstract class ProjectCommand extends Command {
         return JSON.stringify({ [key]: value });
       },
       description:
-        "Additional header to send to server for introspectionQuery. May be used multiple times to add multiple headers. NOTE: The `--endpoint` flag is REQUIRED if using the `--header` flag."
+        "Additional header to send during introspection. May be used multiple times to add multiple headers. NOTE: The `--endpoint` flag is REQUIRED if using the `--header` flag."
     }),
     endpoint: flags.string({
       description: "The url of your service"