Merge pull request #11392 from moxiegirl/copy-edit-contribute

Adding in minor copy edits

docs/sources/project/create-pr.md

@@ -71,7 +71,9 @@ Always rebase and squash your commits before making a pull request.
 
 5. Edit and save your commit message.
 
-		Make sure you include your signature.
+		`git commit -s`
+
+		Make sure your message includes <a href="./set-up-git" target="_blank>your signature</a>.
 
 8. Push any changes to your fork on GitHub.
 

docs/sources/project/set-up-dev-env.md

@@ -23,7 +23,7 @@ You use the `docker` repository and its `Dockerfile` to create a Docker image,
 run a Docker container, and develop code in the container. Docker itself builds,
 tests, and releases new Docker versions using this container.
 
-If you followed the procedures that <a href="../set-up-prereqs" target="_blank">
+If you followed the procedures that <a href="./set-up-prereqs" target="_blank">
 set up the prerequisites</a>, you should have a fork of the `docker/docker`
 repository. You also created a branch called `dry-run-test`. In this section,
 you continue working with your fork on this branch.

docs/sources/project/set-up-git.md

@@ -195,7 +195,7 @@ the branch to your fork on GitHub:
 
 9. Sign and commit your change.
 
-        $ git -s -m "Making a dry run test."
+        $ git commit -s -m "Making a dry run test."
         [dry-run-test 6e728fb] Making a dry run test
          1 file changed, 1 insertion(+)
          create mode 100644 TEST.md