Fix some reStructuredText

CONTRIBUTING.rst

@@ -59,8 +59,8 @@ but doesn't know that there's someone working on it.
 
 Note that you must contribute all your changes under the MIT License. If you are
 just modifying a file, you don't need to do anything (maybe update the copyright
-years). If you are adding new files, you need to use the correct header with the
-copyright and the reference to the MIT License.
+years). If you are adding new files, you need to use the ``SPDX-License-Identifier: MIT``
+header.
 
 1. Fork this repository.
 
@@ -80,4 +80,4 @@ copyright and the reference to the MIT License.
 6. Create a pull request against the branch ``master``.
 
 7. Be prepared to get some comments about your code and to modify it. Tip: Use
-    ``git rebase -i origin/master`` to modify chains of commits.
+   ``git rebase -i origin/master`` to modify chains of commits.

README.rst

@@ -102,7 +102,7 @@ The RGBDS source code file structure is as follows:
   * ``bash_compl`` contains tab completion scripts for use with bash. Run them with ``source``
     somewhere in your ``.bashrc``, and they should load every time you open a shell.
 
-- ``include/`` - header files for the respective source files in `src`.
+- ``include/`` - header files for the respective source files in ``src``.
 
 - ``man/`` - manual pages.
 

RELEASE.rst

@@ -65,4 +65,4 @@ GitHub.
 
 6. Click the "Publish release" button to publish it!
 
-7. Update the `release` branch. You can use ``git push origin release``.
+7. Update the ``release`` branch. You can use ``git push origin release``.