Remove extra semicolon in WriteLineDocTask.cs

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: paulirwin

src/Lucene.Net.Benchmark/ByTask/Tasks/WriteLineDocTask.cs

@@ -113,7 +113,7 @@ public WriteLineDocTask(PerfRunData runData, bool performWriteHeader)
                 throw new ArgumentException("line.file.out must be set");
             }
             Stream @out = StreamUtils.GetOutputStream(m_fname); // LUCENENET specific: changed to use string fileName instead of allocating a FileInfo (#832)
-            m_lineFileOut = new StreamWriter(@out, StandardCharsets.UTF_8); ;
+            m_lineFileOut = new StreamWriter(@out, StandardCharsets.UTF_8);
             docMaker = runData.DocMaker;
 
             // init fields