update the text and fix links

Author: SarahAlidoost

CONTRIBUTING.md

@@ -1,6 +1,6 @@
 # Contributing to ESMValTool tutorial
 
-[ESMValTool][ESMValTool-site] tutorial is an open-source project and we greatly value contributions of all kinds: fixes to this tutorial, bug reports, reviews of pull requests, infrastructure improvements, community help, and outreach. We value the time you invest in contributing and strive to make the process as easy as possible. If you have suggestions for improving the process of contributing, please open an [issue][issues]. To do so, click on [new issue](https://github.com/ESMValGroup/tutorial/issues/new/choose) in the ``issues`` tab of this repository and choose the ``Suggestion`` template.
+[ESMValTool][ESMValTool-site] tutorial is an open-source project and we greatly value contributions of all kinds: fixes to this tutorial, bug reports, reviews of pull requests, infrastructure improvements, community help, and outreach. We value the time you invest in contributing and strive to make the process as easy as possible. If you have suggestions for improving the process of contributing, please open an [issue][issues]. To do so, click on `New issue` in the `issues` tab of this repository and choose the `Suggestion` template.
 
 ## Acknowledgement
 
@@ -27,7 +27,7 @@ You can ask your questions, report problems or suggest improvements by [creating
 This is the easiest way to tell us about your ideas, and a good way to introduce yourself
 and to meet some of our community members.
 This allows us to assign the item to someone and to respond to it in a threaded discussion.
-To open an issue, click on [new issue](https://github.com/ESMValGroup/tutorial/issues/new/choose) in the ``issues`` tab of this repository and choose a template from the list as described below:
+To open an issue, click on `New issue` in the `issues` tab of this repository and choose a template from the [list](https://github.com/ESMValGroup/tutorial/issues/new/choose) as described below:
   * for asking a question, please use `Question and answer`.
   * for reporting a bug, please use `Bug reports`.
   * for developing lesson material, please use `New lesson material`.
@@ -58,7 +58,7 @@ Each lesson is made up of episodes, which are focused on a particular topic and
 
 ### Lesson formatting
 
-Episodes files are [Markdown](https://en.wikipedia.org/wiki/Markdown) files. If you are making a new episode or contributing to existing ones, please make sure the content conforms to the [Carpentries lesson formatting][swc-lesson-formatting].
+Episodes are [Markdown](https://en.wikipedia.org/wiki/Markdown) files. If you are making a new episode or contributing to existing ones, please make sure the content conforms to the [Carpentries lesson formatting][swc-lesson-formatting].
 
 We also, recommend using a linter to check errors in Markdown files.
 For example, a [markdownlint](https://marketplace.visualstudio.com/items?itemName=DavidAnson.vscode-markdownlint) can be installed as an extension in [Visual Studio Code](https://code.visualstudio.com/).
@@ -118,7 +118,7 @@ This address can be opened in your browser to preview the tutorial website.
 General discussion of the tutorial happens in `User Engagement Team`.
 You can reach us by [email][email].
 
-[email]: mailto:TODO_FIX_ME.org
+[email]: mailto:TODO_FIX_ME
 [ESMValTool-site]: https://www.esmvaltool.org/
 [tutorial-repo]: https://esmvalgroup.github.io/tutorial/
 [tutorial-site]: https://esmvalgroup.github.io/tutorial