Update doc

Readme.markdown

@@ -1,11 +1,13 @@
 # Datagrid
 
-[![Build Status](https://github.com/bogdan/datagrid/workflows/CI/badge.svg?branch=master)](https://github.com/bogdan/datagrid/actions)
+Datagrid Version 2.0.0 is here.
+
+[Migration Guide](./version-2).
 
-[![FOSSA Status](https://app.fossa.io/api/projects/git%2Bgithub.heygears.com%2Fbogdan%2Fdatagrid.svg?type=shield)](https://app.fossa.io/projects/git%2Bgithub.heygears.com%2Fbogdan%2Fdatagrid?ref=badge_shield)
+[![Build Status](https://github.com/bogdan/datagrid/workflows/CI/badge.svg?branch=master)](https://github.com/bogdan/datagrid/actions)
 
 A really mighty and flexible ruby library that generates reports
-including admin panels, analytics and data representation:
+including admin panels, analytics and data browsers:
 
 * Filtering
 * Columns
@@ -31,7 +33,7 @@ including admin panels, analytics and data representation:
 
 ## Documentation
 
-* [Readme](/Readme.markdown) - this read-me for basic information.
+* Readme - this read-me for basic information.
 * [Wiki](https://github.com/bogdan/datagrid/wiki) - general reference on how to use the gem.
 * [Rdoc](https://rubydoc.info/gems/datagrid) - API reference.
 

lib/datagrid/form_builder.rb

@@ -6,10 +6,7 @@ module Datagrid
   module FormBuilder
     # @param filter_or_attribute [Datagrid::Filters::BaseFilter, String, Symbol] filter object or filter name
     # @param options [Hash] options of rails form input helper
-    # @return [String] a form input html for the corresponding filter name
-    #   * <tt>select</tt> for enum, xboolean filter types
-    #   * <tt>check_box</tt> for boolean filter type
-    #   * <tt>text_field</tt> for other filter types
+    # @return [String] a form input html for the corresponding filter
     def datagrid_filter(filter_or_attribute, **options, &block)
       filter = datagrid_get_filter(filter_or_attribute)
       send(filter.form_builder_helper_name, filter, **options, &block)