docs: replace git checkout with git switch

Author: kenjis

contributing/workflow.md

@@ -78,7 +78,7 @@ Then synchronizing is done by pulling from us and pushing to you. This
 is normally done locally, so that you can resolve any merge conflicts.
 For instance, to synchronize **develop** branches:
 
-    git checkout develop
+    git switch develop
     git fetch upstream
     git merge upstream/develop
     git push origin develop
@@ -109,8 +109,8 @@ For instance, make sure you are in the *develop* branch, and create a
 new feature branch, based on *develop*, for a new feature you are
 creating:
 
-    git checkout develop
-    git checkout -b new/mind-reader
+    git switch develop
+    git switch -c new/mind-reader
 
 Saving changes only updates your local working area.
 
@@ -131,15 +131,15 @@ Just make sure that your commits in a feature branch are all related.
 If you are working on two features at a time, then you will want to
 switch between them to keep the contributions separate. For instance:
 
-    git checkout new/mind-reader
+    git switch new/mind-reader
     // work away
     git add .
     git commit -S -m "Added adapter for abc"
-    git checkout fix/issue-123
+    git switch fix/issue-123
     // work away
     git add .
     git commit -S -m "Fixed problem in DEF\Something"
-    git checkout develop
+    git switch develop
 
 The last checkout makes sure that you end up in your *develop* branch as
 a starting point for your next session working with your repository.
@@ -157,14 +157,14 @@ It is a lot easier to resolve conflicts at this stage.
 
 Synchronize your repository:
 
-    git checkout develop
+    git switch develop
     git fetch upstream
     git merge upstream/develop
     git push origin develop
 
 Bring your feature branch up to date:
 
-    git checkout new/mind-reader
+    git switch new/mind-reader
     git rebase upstream/develop
 
 And finally push your local branch to your GitHub repository:
@@ -223,14 +223,14 @@ do the following:
 
 Synchronize your repository:
 
-    git checkout develop
+    git switch develop
     git fetch upstream
     git merge upstream/develop
     git push origin develop
 
 Bring your feature branch up to date:
 
-    git checkout new/mind-reader
+    git switch new/mind-reader
     git rebase upstream/develop
 
 You might get conflicts when you rebase. It is your