docs(textarea): add grow option

Author: Kamil Kisiela

docs/types/textarea.md

@@ -1,26 +1,36 @@
-# textarea
-## textarea
+textarea
+========
+
+textarea
+--------
 
 ### Example
 
 ```javascript
 {
-  "type": "textarea",
-  "key": "bio",
-  "templateOptions": {
-    "label": "Biography",
-    "theme": "custom",
-    "rows": 5
+  type: "textarea",
+  key: "bio",
+  templateOptions: {
+    label: "Biography",
+    theme: "custom",
+    rows: 5,
+    grow: false
   }
 }
 ```
 
 #### Configuration
 
-#### templateOptions.label _: string_
+#### templateOptions.label *: string*
+
+#### templateOptions.theme *: string*
+
+#### templateOptions.rows *: integer*
+
+Number of rows
 
-#### templateOptions.theme _: string_
+#### templateOptions.grow *: boolean (default true)*
 
-#### templateOptions.rows _: integer_
+Equivalent to md-no-autogrow
 
-Number of rows
+When present, textareas will not grow automatically.