docs: update quickstart.mdx (#1283)

### What problem does this PR solve?

minor fix

### Type of change

- [x] Documentation Update

docs/quickstart.mdx

 <details>
   <summary>1. Ensure <code>vm.max_map_count</code> &ge; 262144:</summary>
 
-   `vm.max_map_count`. This value sets the the maximum number of memory map areas a process may have. Its default value is 65530. While most applications require fewer than a thousand maps, reducing this value can result in abmornal behaviors, and the system will throw out-of-memory errors when a process reaches the limitation. 
+   `vm.max_map_count`. This value sets the maximum number of memory map areas a process may have. Its default value is 65530. While most applications require fewer than a thousand maps, reducing this value can result in abmornal behaviors, and the system will throw out-of-memory errors when a process reaches the limitation. 
 
    RAGFlow v0.7.0 uses Elasticsearch for multiple recall. Setting the value of `vm.max_map_count` correctly is crucial to the proper functioning of the Elasticsearch component.