docs: Incorporate review suggestions

Signed-off-by: Jussi Kukkonen <jkukkonen@google.com>

Author: jku

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,7 +1,8 @@
 <!--
 Before submitting a pull request:
-  * Please run linter and tests locally: "tox"
+  * Run linter and tests locally: Use "tox"
   * Ensure your commits are signed-off-by: Use "commit --signoff"
+  * Make sure new code has tests and is documented
   * For more info, see docs/CONTRIBUTING.rst
 
 Once commits are signed off and tested, describe the purpose and contents
@@ -15,10 +16,3 @@ of the pull request below.
 
 Fixes #<ISSUE NUMBER>
 
-
-<!-- Please check relevant options (you can remove the ones that do not apply) -->
-- [ ] The code follows the [Code Style Guidelines](https://github.com/secure-systems-lab/code-style-guidelines#code-style-guidelines)
-- [ ] Tests have been added for the bug fix or new feature
-- [ ] Docs have been added for the bug fix or new feature
-
-

docs/CONTRIBUTING.rst

@@ -72,7 +72,7 @@ Auto-formatting
 ---------------
 
 The linter in CI/CD will check that new TUF code is formatted with
-`ruff<https://docs.astral.sh/ruff/>`__. Auto-formatting can be done on the
+`ruff <https://docs.astral.sh/ruff/>`_. Auto-formatting can be done on the
 command line:
 ::