(#170) Update docs & release notes

Author: colinangusmackay

docs/docs/library/xunit-extensions.md

@@ -40,4 +40,13 @@ public class ThingamajigTests
         _output.WriteLogs(logProvider.GetAllLogEntries())
     }
 }
-```
+```
+
+#### Variants
+
+* `ITestOutputHelper.WriteLogs(ITestCaptureLogger logger, Func<LogEntry, string>? formatter = null)`
+  * Available from v3.0
+  * Takes an `ITestCaptureLogger` and outputs all of the log messages captured by that logger.
+* `ITestOutputHelper.WriteLogs(TestCaptureLoggerProvider provider, Func<LogEntry, string>? formatter = null)`
+  * Available from v3.0
+  * Takes an `TestCaptureLoggerProvider` and outputs all of the log messages captured by all the loggers in the provider.

release-notes/wip-release-notes.md

@@ -15,6 +15,9 @@ Date: ???
 - #123: `TestCaptureLoggerProvider.CreateLogger<T>()`
   - Potential breaking change: `TestCaptureLogger<T>` no longer inherits from `TestCaptureLogger`.
   - Add `ITestCaptureLogger` and have `TestCaptureLogger` and `TestCaptureLogger<T>` be concrete implementations of the interface so you can reference the interface and not care which concrete implementation you have.
+- #170: Additional xunit extension methods to write out all log messages to the `ITestOutputHelper`.
+  - `ITestOutputHelper.WriteLogs(ITestCaptureLogger...)`
+  - `ITestOutputHelper.WriteLogs(TestCaptureLoggerProvider...)`
 
 ### Miscellaneous