Combine non-ASCII character PRs #2638 and #2584 into one highlight point

Author: weiji14

doc/changes.md

@@ -7,14 +7,9 @@
 ### Highlights
 
 * 🎉 **Tenth minor release of PyGMT** 🎉
-*
+* Support non-ASCII characters in Figure.text ([#2638](https://github.com/GenericMappingTools/pygmt/pull/2638)) and other function arguments ([#2584](https://github.com/GenericMappingTools/pygmt/pull/2584))
 * Two new tutorials and seven new gallery examples
 
-### New Features
-
-* Support non-ASCII characters in function arguments ([#2584](https://github.com/GenericMappingTools/pygmt/pull/2584))
-* Figure.text: Support non-ASCII characters in the 'text' parameter ([#2638](https://github.com/GenericMappingTools/pygmt/pull/2638))
-
 ### Enhancements
 
 * Figure.colorbar: Add alias for "Q" ([#2608](https://github.com/GenericMappingTools/pygmt/pull/2608))