ARROW-11576: [Rust] Fix unused variable in Rust code example

Joey9801 · nevi-me · commit 8a968eacfe25 · 2021-02-11T20:43:52.000+02:00
Port of #9308 from @Joey9801 -- that PR got messed up with all the rebasing nonsense that happened as part of the 3.0.0 release. Closes #9459 from alamb/ARROW-11576 Authored-by: Joe Roberts <Joey9801@users.noreply.github.com> Signed-off-by: Neville Dipale <nevilledips@gmail.com>
diff --git a/rust/parquet/src/file/mod.rs b/rust/parquet/src/file/mod.rs
@@ -67,7 +67,6 @@
 //!
 //! let path = Path::new("/path/to/sample.parquet");
 //! if let Ok(file) = File::open(&path) {
-//!     let file = File::open(&path).unwrap();
 //!     let reader = SerializedFileReader::new(file).unwrap();
 //!
 //!     let parquet_metadata = reader.metadata();
