docs: update README to reflect parameter name change from 'global' to 'isGlobal'

Author: Alpha018

README.md

@@ -49,7 +49,7 @@ import { UnleashClientModule } from '@alpha018/nestjs-unleash-client';
         url: 'http://unleash.herokuapp.com/api/',
         appName: 'my-nestjs-app',
       },
-      global: true, // Make the module and its providers global
+      isGlobal: true, // Make the module and its providers global
     }),
     // ...
   ],
@@ -85,12 +85,12 @@ export class AppModule {}
 
 ## Parameter Options
 
-Options for `forRoot`:
+Options for `forRoot` and `forRootAsync`:
 
 | Parameter | Type              | Required | Description                                                                    |
 |-----------|-------------------|----------|--------------------------------------------------------------------------------|
 | `config`  | `UnleashConfig`   | Yes      | The configuration object for the `unleash-client`. See options below.          |
-| `global`  | `boolean`         | No       | If `true`, the module will be registered as a global module. Defaults to `false`. |
+| `isGlobal`  | `boolean`         | No       | If `true`, the module will be registered as a global module. Defaults to `false`. |
 
 The `config` object is passed directly to the `unleash-client`. The most common options are:
 
@@ -101,8 +101,6 @@ The `config` object is passed directly to the `unleash-client`. The most common
 | `customHeaders`    | `object` | No       | Custom headers to be sent to the Unleash API. Use `Authorization` for the API key generated by the Unleash panel. |
 | `...`              | `any`    | No       | Any other valid option from the [official unleash-client-node documentation](https://docs.getunleash.io/reference/sdks/node). |
 
-For `forRootAsync`, `isGlobal` is used instead of `global`.
-
 ### Protecting a Route with a Feature Toggle
 To protect an endpoint with a feature toggle, use the `@UnleashToggle` decorator. The global `UnleashGuard` will automatically deny access if the feature is disabled.