Docs (#30)

* migrate sort array int

* migrate sort array string

* migrate hash set int

* migrate hash set string

* add mutable map

* add api intro

* add re signature annotation

Author: nikgraf

pages/belt_docs/hash-set-int.mdx

@@ -1,118 +1,127 @@
 import { make as Layout } from "../../layouts/BeltDocsLayout.bs.js";
+import { make as ApiIntro } from "../../components/ApiIntro.bs.js";
 export default Layout;
 
 # HashSetInt
 
+<ApiIntro>
+
+This module is `Belt.HashSet` specialized with key type to be a primitive type.
+
+It is more efficient in general, the API is the same with `Belt.HashSet` except its key type is fixed, and identity is not needed(using the built-in one).
+
+</ApiIntro>
+
 ## key
 
-```
+```re sig
 type key = int;
 ```
 
 ## t
 
-```
+```re sig
 type t;
 ```
 
 ## make
 
-```
+```re sig
 let make: (~hintSize: int) => t;
 ```
 
 ## clear
 
-```
+```re sig
 let clear: t => unit;
 ```
 
 ## isEmpty
 
-```
+```re sig
 let isEmpty: t => bool;
 ```
 
 ## add
 
-```
+```re sig
 let add: (t, key) => unit;
 ```
 
 ## copy
 
-```
+```re sig
 let copy: t => t;
 ```
 
 ## has
 
-```
+```re sig
 let has: (t, key) => bool;
 ```
 
 ## remove
 
-```
+```re sig
 let remove: (t, key) => unit;
 ```
 
 ## forEachU
 
-```
+```re sig
 let forEachU: (t, [@bs] (key => unit)) => unit;
 ```
 
 ## forEach
 
-```
+```re sig
 let forEach: (t, key => unit) => unit;
 ```
 
 ## reduceU
 
-```
+```re sig
 let reduceU: (t, 'c, [@bs] (('c, key) => 'c)) => 'c;
 ```
 
 ## reduce
 
-```
+```re sig
 let reduce: (t, 'c, ('c, key) => 'c) => 'c;
 ```
 
 ## size
 
-```
+```re sig
 let size: t => int;
 ```
 
 ## logStats
 
-```
+```re sig
 let logStats: t => unit;
 ```
 
 ## toArray
 
-```
+```re sig
 let toArray: t => array(key);
 ```
 
 ## fromArray
 
-```
+```re sig
 let fromArray: array(key) => t;
 ```
 
 ## mergeMany
 
-```
+```re sig
 let mergeMany: (t, array(key)) => unit;
 ```
 
 ## getBucketHistogram
 
-```
+```re sig
 let getBucketHistogram: t => array(int);
 ```

pages/belt_docs/hash-set-string.mdx

@@ -1,118 +1,127 @@
 import { make as Layout } from "../../layouts/BeltDocsLayout.bs.js";
+import { make as ApiIntro } from "../../components/ApiIntro.bs.js";
 export default Layout;
 
 # HashSetString
 
+<ApiIntro>
+
+This module is `Belt.HashSet` specialized with key type to be a primitive type.
+
+It is more efficient in general, the API is the same with `Belt.HashSet` except its key type is fixed, and identity is not needed(using the built-in one).
+
+</ApiIntro>
+
 ## key
 
-```
+```re sig
 type key = string;
 ```
 
 ## t
 
-```
+```re sig
 type t;
 ```
 
 ## make
 
-```
+```re sig
 let make: (~hintSize: int) => t;
 ```
 
 ## clear
 
-```
+```re sig
 let clear: t => unit;
 ```
 
 ## isEmpty
 
-```
+```re sig
 let isEmpty: t => bool;
 ```
 
 ## add
 
-```
+```re sig
 let add: (t, key) => unit;
 ```
 
 ## copy
 
-```
+```re sig
 let copy: t => t;
 ```
 
 ## has
 
-```
+```re sig
 let has: (t, key) => bool;
 ```
 
 ## remove
 
-```
+```re sig
 let remove: (t, key) => unit;
 ```
 
 ## forEachU
 
-```
+```re sig
 let forEachU: (t, [@bs] (key => unit)) => unit;
 ```
 
 ## forEach
 
-```
+```re sig
 let forEach: (t, key => unit) => unit;
 ```
 
 ## reduceU
 
-```
+```re sig
 let reduceU: (t, 'c, [@bs] (('c, key) => 'c)) => 'c;
 ```
 
 ## reduce
 
-```
+```re sig
 let reduce: (t, 'c, ('c, key) => 'c) => 'c;
 ```
 
 ## size
 
-```
+```re sig
 let size: t => int;
 ```
 
 ## logStats
 
-```
+```re sig
 let logStats: t => unit;
 ```
 
 ## toArray
 
-```
+```re sig
 let toArray: t => array(key);
 ```
 
 ## fromArray
 
-```
+```re sig
 let fromArray: array(key) => t;
 ```
 
 ## mergeMany
 
-```
+```re sig
 let mergeMany: (t, array(key)) => unit;
 ```
 
 ## getBucketHistogram
 
-```
+```re sig
 let getBucketHistogram: t => array(int);
 ```