update pageGrid component docs

Author: a-hariti

docs/contributing/pages/components.mdx

@@ -119,7 +119,7 @@ See also the [Alert component](#alert).
 
 ## PageGrid
 
-Render all child pages of this document, including their `description` if available.
+Render all child pages or `next_steps` of this document, including their `description` if available.
 
 ```markdown {tabTitle:Example}
 <PageGrid />
@@ -128,7 +128,6 @@ Render all child pages of this document, including their `description` if availa
 Attributes:
 
 - `header` (string) - optional header value to include, rendered as an H2
-- `nextPages` (boolean) - only render pages which come next based on sidebar ordering
 
 ## PlatformContent
 

src/components/pageGrid.tsx

@@ -7,12 +7,6 @@ import {serverContext} from 'sentry-docs/serverContext';
 import {isTruthy} from 'sentry-docs/utils';
 
 type Props = {
-  nextPages: boolean;
-  /**
-   * A list of pages to exclude from the grid.
-   * Specify the file name of the page, for example, "index" for "index.mdx"
-   */
-  exclude?: string[];
   header?: string;
 };