Code example misses iEnumerable

**Describe the bug**
Displayed C# code doesn't work

**To Reproduce**
Go to the wiki and look at source code C# "Example 1"
https://github.com/commandlineparser/commandline/wiki/HelpText-Configuration

**Additional context**
The the code "Example 1" following code is wrong:
```
static void DisplayHelp(ParserResult result)
```

It should be
```
static void DisplayHelp(ParserResult result,IEnumerable< Error> errs)
```

Open the HelpText-Configuration wiki page and inspect the C# “Example 1” source shown in the issue. Update the example's DisplayHelp signature to include the IEnumerable errs parameter, then verify that the displayed code matches the requested signature and remains valid C#.

Written by the indexing model from the issue text.