chore(docs): Markdown housekeeping (#1969)

* Remove gitter from CONTRIBUTING.md
* Remove year from copyright
* Add Copyright prop for package
* CloseAndFlushAsync comment
* More shepherding to SO

CONTRIBUTING.md

@@ -7,7 +7,7 @@ The following are a set of guidelines for contributing to [Serilog](https://seri
 
 ## Where to start?
 
-The [Serilog repository][serilog] is the location for enhancements and fixes to the core library.  Generally we try to keep the core library lean and performant while attempting to deliver the features of a first class logging library.  
+The [Serilog repository][serilog] is the location for enhancements and fixes to the core library.  Generally we try to keep the core library lean and performant while attempting to deliver the features of a first class logging library.
 
 If you are interested in contributing to a [sink][sinks] or one of the other [community projects][community_projects] then please create a PR in the respective repository.
 
@@ -52,7 +52,6 @@ Serilog has an active and helpful community who are happy to help point you in t
 
  * [Stack Overflow](http://stackoverflow.com/questions/tagged/serilog) - this is the best place to start if you have a question
  * Our [issue tracker](https://github.com/serilog/serilog/issues) here on GitHub
- * [Gitter chat](https://gitter.im/serilog/serilog)
  * The [#serilog tag on Twitter](https://twitter.com/search?q=%23serilog)
 
 

Directory.Build.props

@@ -7,10 +7,11 @@
     <CheckEolTargetFramework>false</CheckEolTargetFramework>
     <Nullable>enable</Nullable>
     <ImplicitUsings>enable</ImplicitUsings>
+    <Copyright>Copyright © 2013-23 Serilog Contributors</Copyright>
   </PropertyGroup>
   <ItemGroup Condition="'$(TargetFrameworkIdentifier)' == '.NETFramework'">
     <Reference Include="System" />
     <Reference Include="System.Core" />
     <Reference Include="Microsoft.CSharp" />
   </ItemGroup>
-</Project>
+</Project>

README.md

@@ -91,7 +91,7 @@ catch (Exception ex)
 }
 finally
 {
-    await Log.CloseAndFlushAsync();
+    await Log.CloseAndFlushAsync(); // ensure all logs written before app exits
 }
 ```
 
@@ -103,11 +103,12 @@ To learn more about Serilog, check out the [documentation](https://github.com/se
 
 Serilog has an active and helpful community who are happy to help point you in the right direction or work through any issues you might encounter. You can get in touch via:
 
- * [Stack Overflow](http://stackoverflow.com/questions/tagged/serilog) — this is the best place to start if you have a question
+ * [Stack Overflow](http://stackoverflow.com/questions/tagged/serilog) — this is the best place to start if you have a question. Many track the `serilog` tag there.
  * The [#serilog tag on Twitter](https://twitter.com/search?q=%23serilog)
  * [Serilog-related courses on Pluralsight](https://www.pluralsight.com/search/?q=serilog)
 
-We welcome bug reports and suggestions through our [issue tracker](https://github.com/serilog/serilog/issues) here on GitHub.
+We welcome reproducible bug reports and detailed feature requests through [our GitHub issue tracker](https://github.com/serilog/serilog/issues);
+note the other resource are much better for quick questions or seeking usage help.
 
 ### Contributing
 
@@ -122,4 +123,4 @@ When contributing please keep in mind our [Code of Conduct](CODE_OF_CONDUCT.md).
 | `dev`  | [![Build status](https://ci.appveyor.com/api/projects/status/b9rm3l7kduryjgcj/branch/dev?svg=true)](https://ci.appveyor.com/project/serilog/serilog/branch/dev)       |
 | `main` | [![Build status](https://ci.appveyor.com/api/projects/status/b9rm3l7kduryjgcj/branch/master?svg=true)](https://ci.appveyor.com/project/serilog/serilog/branch/master) |
 
-_Serilog is copyright © 2013-2020 Serilog Contributors - Provided under the [Apache License, Version 2.0](http://apache.org/licenses/LICENSE-2.0.html). Needle and thread logo a derivative of work by [Kenneth Appiah](http://www.kensets.com/)._
+_Serilog is copyright © Serilog Contributors - Provided under the [Apache License, Version 2.0](http://apache.org/licenses/LICENSE-2.0.html). Needle and thread logo a derivative of work by [Kenneth Appiah](http://www.kensets.com/)._