I think this whole `<para/>` section should be moved under the `<summary/>` one so that it reads like

```
/// <summary>
/// Inserts a <see cref="Commit"/> into the object database, referencing an existing <see cref="Tree"/>.
/// <para>
///   Prettifying the message includes:
///   * Removing empty lines from the beginning and end.
///   * Removing trailing spaces from every line.
///   * Turning multiple consecutive empty lines between paragraphs into just one empty line.
///   * Ensuring the commit message ends with a newline.
///   * Removing every line starting with "#".
/// </para>
/// </summary>
```