docs(contribute): correct an example in the writers-guide (#1727)

In a section which states the properties must be sorted alphabetically, sort 
the examples alphabetically.

Author: lhoff

src/content/contribute/writers-guide.md

@@ -92,8 +92,8 @@ Same goes for tables.
 
 The [configuration](/configuration) properties should be ordered alphabetically as well:
 
-- `devServer.contentBase`
 - `devServer.compress`
+- `devServer.contentBase`
 - `devServer.hot`
 
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