fix(doc): Firecrawl package issue (#5284)

- replace the incorrectly spelled npm package with the correct one.
npm install @mendableai/firecrawl-js (incorrect)
npm install @mendable/firecrawl-js (correct)

docs/core_docs/docs/integrations/document_loaders/web_loaders/firecrawl.mdx

@@ -28,7 +28,7 @@ import CodeBlock from "@theme/CodeBlock";
 import Example from "@examples/document_loaders/firecrawl.ts";
 
 ```bash npm2yarn
-npm install @mendableai/firecrawl-js
+npm install @mendable/firecrawl-js
 ```
 
 <CodeBlock language="typescript">{Example}</CodeBlock>