correct few typos from previous commits

README.md

@@ -2,7 +2,7 @@
 
 This project contains the source files (rst format) allowing to build the [html files for NEMO User's guide](https://sites.nemo-ocean.io/user-guide/)
 
-The NEMO guide is made up of several files written in [ReStructuredText](http://docutils.sourceforge.net/rst.htmil) (`.rst` extension), a WYSIWYG markup language used in the Python community.
+The NEMO guide is made up of several files written in [ReStructuredText](http://docutils.sourceforge.net/rst.html) (`.rst` extension), a WYSIWYG markup language used in the Python community.
 
 If you want to make some changes and updates, you can edit the rst source files in the `./source` folder.
 

source/changes.rst

@@ -2,7 +2,7 @@
 Changes since 4.2.0
 ###################
 
-List of the main bugfixes in the new 4.2.1 release - March 2023
+List of the main bugfixes in the new 4.2.1 release - May 2023
 
 **KERNEL**