chore: added comments to Ascii

Author: petrknap

src/Ascii.php

@@ -6,6 +6,8 @@
 
 /**
  * @see https://datatracker.ietf.org/doc/html/rfc20
+ *
+ * @todo upgrade to PHP 8.2 and move values to cases
  */
 enum Ascii: string
 {
@@ -15,10 +17,22 @@ enum Ascii: string
     public const RECORD_SEPARATOR = "\x1E";
     public const UNIT_SEPARATOR = "\x1F";
 
+    /**
+     * Separates different files (databases)
+     */
     case FileSeparator = self::FILE_SEPARATOR;
+    /**
+     * Separates different groups (tables) of the same file (database)
+     */
     case GroupSeparator = self::GROUP_SEPARATOR;
     case Null = self::NULL;
+    /**
+     * Separates different records (rows) of the same group (table)
+     */
     case RecordSeparator = self::RECORD_SEPARATOR;
+    /**
+     * Separates different units (columns) of the same record (row)
+     */
     case UnitSeparator = self::UNIT_SEPARATOR;
 
     /**