[MINOR][DOCS] Fix some typos in LZFBenchmark

### What changes were proposed in this pull request?

This RP aims to fix some typos in `LZFBenchmark`.

### Why are the changes needed?

Fix typos and avoid confusion.

### Does this PR introduce _any_ user-facing change?

No.

### How was this patch tested?

Pass GA.

### Was this patch authored or co-authored using generative AI tooling?

No.

Closes apache#47435 from wayneguow/lzf.

Authored-by: Wei Guo <guow93@gmail.com>
Signed-off-by: Hyukjin Kwon <gurwls223@apache.org>

core/src/test/scala/org/apache/spark/io/LZFBenchmark.scala

@@ -25,13 +25,13 @@ import org.apache.spark.benchmark.{Benchmark, BenchmarkBase}
 import org.apache.spark.internal.config.IO_COMPRESSION_LZF_PARALLEL
 
 /**
- * Benchmark for ZStandard codec performance.
+ * Benchmark for LZF codec performance.
  * {{{
  *   To run this benchmark:
  *   1. without sbt: bin/spark-submit --class <this class> <spark core test jar>
  *   2. build/sbt "core/Test/runMain <this class>"
  *   3. generate result: SPARK_GENERATE_BENCHMARK_FILES=1 build/sbt "core/Test/runMain <this class>"
- *      Results will be written to "benchmarks/ZStandardBenchmark-results.txt".
+ *      Results will be written to "benchmarks/LZFBenchmark-results.txt".
  * }}}
  */
 object LZFBenchmark extends BenchmarkBase {