doc: resolve empty doc comment (#14)

src/lib.rs

@@ -181,7 +181,8 @@ pub enum SemverErrorKind {
     Context(&'static str),
 
     /**
-     */
+    This error happens only when all of the range is invalid.
+    */
     #[error("No valid ranges could be parsed")]
     #[diagnostic(code(node_semver::no_valid_ranges), url(docsrs), help("node-semver parses in so-called 'loose' mode. This means that if you have a slightly incorrect semver operator (`>=1.y`, for ex.), it will get thrown away. This error only happens if _all_ your input ranges were invalid semver in this way."))]
     NoValidRanges,