fix typo and reduce benchmark run time

Author: adelinowona

benchmarks/MongoDB.Driver.Benchmarks/MultiDoc/BulkWriteMixedOpsBenchmark.cs

@@ -21,7 +21,7 @@
 
 namespace MongoDB.Benchmarks.MultiDoc
 {
-    [IterationCount(100)]
+    [IterationCount(50)]
     [BenchmarkCategory(DriverBenchmarkCategory.BulkWriteBench, DriverBenchmarkCategory.MultiBench, DriverBenchmarkCategory.WriteBench, DriverBenchmarkCategory.DriverBench)]
     public class BulkWriteMixedOpsBenchmark
     {

benchmarks/MongoDB.Driver.Benchmarks/README.md

@@ -13,7 +13,7 @@ This suite implements the benchmarks described in this [spec](https://github.com
    (e.g `dotnet run -c Release -- --driverBenchmarks --envVars MONGODB_URI:"ConnectionString"`)
 
 You can also select the benchmarks to run directly on the command for running the benchmarks as such
-`dotnet run -c Release -- --driverBenchmarks --fitler "*BenchmarkClassName*"`. The benchmarks are also grouped into categories namely: BSONBench, WriteBench
+`dotnet run -c Release -- --driverBenchmarks --filter "*BenchmarkClassName*"`. The benchmarks are also grouped into categories namely: BSONBench, WriteBench
 ReadBench, ParallelBench, SingleBench, MultiBench and DriverBench. So if you wanted to only run the WriteBench benchmarks, you can do so
 as follows: `dotnet run -c Release -- --driverBenchmarks --anyCategories "WriteBench"`.