Explain how to write posts with special characters

go/blog/blog.yaml

@@ -42,6 +42,13 @@
    Optionally you can specify a `date` field.
    If `content` starts with a non-alphabetic character, you need to
    start the value with a vertical bar `|`:
        - title: Special characters...
          content: |
            *This* post starts with a special character.
    There are a few other types of posts:
    * `shell`, similar to text, but `title` is a shell command