docs: advanced usage of punctuation unification

docs/design.md

@@ -176,9 +176,7 @@ We are figuring out all the requirements by several options below:
 
 These options can format and determine punctuations to be used.
 
-The option `adjustedFullWidthPunctuation` defines which fullwidth punctuations zhlint will treat them as halfwidth punctuations when processing the further spaces issues around them. Usually it's just about quotations since the fullwidth quotations in morder Chinese fonts actually are only rendered in halfwidth.
-
-<!-- TODO: more details about `adjustedFullWidthPunctuation` -->
+The option `adjustedFullWidthPunctuation` defines which fullwidth punctuations zhlint will treat them as halfwidth punctuations when processing the further spaces issues around them. Usually it's just about quotations since the fullwidth quotations in morder Chinese fonts actually are only rendered in halfwidth. For more details, including advanced usage, see README.
 
 **For spaces**
 

docs/index.md

@@ -319,6 +319,40 @@ type RuleOptions = {
   // Convert traditional Chinese punctuations into simplified ones or vice versa.
   // default preset: `simplified`
   // e.g. `「文字」` -> `“文字”`
+  //
+  // besides the above, we also unify some common punctuations below:
+  //
+  // // U+2047 DOUBLE QUESTION MARK, U+203C DOUBLE EXCLAMATION MARK
+  // // U+2048 QUESTION EXCLAMATION MARK, U+2049 EXCLAMATION QUESTION MARK
+  // '？？': ['⁇'],
+  // '！！': ['‼'],
+  // '？！': ['⁈'],
+  // '！？': ['⁉'],
+  //
+  // // U+002F SOLIDUS, U+FF0F FULLWIDTH SOLIDUS
+  // '/': ['/', '／'],
+  //
+  // // U+FF5E FULLWIDTH TILDE
+  // '~': ['~', '～'],
+  //
+  // // U+2026 HORIZONTAL ELLIPSIS, U+22EF MIDLINE HORIZONTAL ELLIPSIS
+  // '…': ['…', '⋯'],
+  //
+  // // U+25CF BLACK CIRCLE, U+2022 BULLET, U+00B7 MIDDLE DOT,
+  // // U+2027 HYPHENATION POINT, U+30FB KATAKANA MIDDLE DOT
+  // '·': ['●', '•', '·', '‧', '・'],
+  //
+  // advanced usage: you can also specify a more detailed map like:
+  //
+  // ```
+  // {
+  //   default: true, // follow all the default preset
+  //   '「': ['“', '【'], // convert `“` or `【` into `「`
+  //   '」': ['”', '】'], // convert `”` or `】` into `」`
+  //  '…': true, // follow the default preset for this character
+  //  '·': false, // not unify any of these characters
+  // }
+  // ```
   unifiedPunctuation?: 'traditional' | 'simplified' | Record<string, boolean | string[]> & { default: boolean }
 
   // Special case: skip `fullWidthPunctuation` for abbreviations.