🐛 Frontmatter typo (#1500)

docs/frontmatter.md

@@ -360,7 +360,7 @@ The `authors` field is a list of `author` objects. Available fields in the autho
 * - `equal_contributor`
   - a boolean (true/false), indicates that the author is an equal contributor
 * - `deceased`
-  - a boolean (true/false), indicates that the author is an deceased
+  - a boolean (true/false), indicates that the author is deceased
 * - `twitter`
   - a twitter username
 * - `github`
@@ -542,6 +542,7 @@ The date field is a string and should conform to a well-defined calendar date. E
 - `Sat, 1 Jan 2000` - `DAY, DD? MON YYYY`
 
 These dates correspond to two main formats:
+
 - A strict (full, extended) calendar date defined by [ISO 8601](https://en.wikipedia.org/wiki/ISO_8601) (see also [RFC 3339](https://datatracker.ietf.org/doc/html/rfc3339))
 - A date-only variant of [RFC 2822](https://datatracker.ietf.org/doc/html/rfc2822), built using the RFC gammar rules.