Docs for SummaryStyle (#2510)

* Added SummaryStyle doc and sample

* Fixed link to source code

* correct spelling

Author: MattFromRVA

docs/articles/samples/IntroSummaryStyle.md

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+---
+uid: BenchmarkDotNet.SummaryStyle
+---
+
+## SummaryStyle in BenchmarkDotNet
+
+`SummaryStyle` is a class in BenchmarkDotNet that allows customization of the summary reports of benchmark results. It offers several properties to fine-tune how the results are displayed.
+
+### Usage
+
+You can customize the summary report by specifying various properties of `SummaryStyle`. These properties include formatting options like whether to print units in the header or content, setting the maximum width for parameter columns, and choosing units for size and time measurements.
+
+### Source Code
+
+[!code-csharp[IntroSummaryStyle.cs](../../../samples/BenchmarkDotNet.Samples/IntroSummaryStyle.cs)]
+
+### Properties
+
+- `PrintUnitsInHeader`: Boolean to indicate if units should be printed in the header.
+- `PrintUnitsInContent`: Boolean to control unit printing in the content.
+- `PrintZeroValuesInContent`: Determines if zero values should be printed.
+- `MaxParameterColumnWidth`: Integer defining the max width for parameter columns.
+- `SizeUnit`: Optional `SizeUnit` to specify the unit for size measurements.
+- `TimeUnit`: Optional `TimeUnit` for time measurement units.
+- `CultureInfo`: `CultureInfo` to define culture-specific formatting.
+
+### Example Output
+
+Using SummaryStyle options:
+
+```markdown
+| Method | N   | Mean [ns]     | Error [ns] | StdDev [ns] |
+|------- |---- |--------------:|-----------:|------------:|
+| Sleep  | 10  |  15,644,973.1 |   32,808.7 |    30,689.3 |
+| Sleep  | 100 | 109,440,686.7 |  236,673.8 |   221,384.8 |
+```
+
+Default:
+
+```markdown
+| Method | N   | Mean      | Error    | StdDev   |
+|------- |---- |----------:|---------:|---------:|
+| Sleep  | 10  |  15.65 ms | 0.039 ms | 0.034 ms |
+| Sleep  | 100 | 109.20 ms | 0.442 ms | 0.392 ms |
+```
+
+### Links
+
+* @docs.SummaryStyle
+* The permanent link to this sample: @BenchmarkDotNet.Samples.IntroSummaryStyle
+

samples/BenchmarkDotNet.Samples/IntroSummaryStyle.cs

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+using System.Globalization;
+using BenchmarkDotNet.Attributes;
+using BenchmarkDotNet.Configs;
+using BenchmarkDotNet.Reports;
+using BenchmarkDotNet.Columns;
+using Perfolizer.Horology;
+
+namespace BenchmarkDotNet.Samples
+{
+    [Config(typeof(Config))]
+    public class IntroSummaryStyle
+    {
+        private class Config : ManualConfig
+        {
+            public Config()
+            {
+                // Configure the summary style here
+                var summaryStyle = new SummaryStyle
+                (
+                    cultureInfo: CultureInfo.InvariantCulture,
+                    printUnitsInHeader: true,
+                    printUnitsInContent: false,
+                    sizeUnit: SizeUnit.KB,
+                    timeUnit: TimeUnit.Nanosecond,
+                    maxParameterColumnWidth: 20
+
+                );
+
+                WithSummaryStyle(summaryStyle);
+            }
+        }
+
+        [Params(10, 100)]
+        public int N;
+
+        [Benchmark]
+        public void Sleep() => System.Threading.Thread.Sleep(N);
+    }
+}