docs: Improve Arrow key feature description (pola-rs#21171)

Author: edwinvehmaanpera

Diff for: docs/source/index.md

@@ -33,9 +33,9 @@ in Rust, and available for Python, R and NodeJS.
 - **Vectorized Query Engine**
 - **GPU Support**: Optionally run queries on NVIDIA GPUs for maximum performance for in-memory
   workloads.
-- **[Apache Arrow support](https://arrow.apache.org/)**: Polars consume and produce Arrow data often
-  zero-copy. Note that Polars is not build on a Pyarrow/Arrow implementation. Polars has written all
-  compute and buffer implementations.
+- **[Apache Arrow support](https://arrow.apache.org/)**: Polars can consume and produce Arrow data
+  often with zero-copy operations. Note that Polars is not built on a Pyarrow/Arrow implementation.
+  Instead, Polars has its own compute and buffer implementations.
 
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