Update doc for TagHelper.

actionview/lib/action_view/helpers/tag_helper.rb

@@ -42,7 +42,8 @@ module ActionView
       # For example, a key +user_id+ would render as <tt>data-user-id</tt> and
       # thus accessed as <tt>dataset.userId</tt>.
       #
-      # Values are encoded to JSON, with the exception of strings and symbols.
+      # Values are encoded to JSON, with the exception of strings, symbols and
+      # BigDecimals.
       # This may come in handy when using jQuery's HTML5-aware <tt>.data()</tt>
       # from 1.4.3.
       #
@@ -56,6 +57,9 @@ module ActionView
       #   tag("input", type: 'text', disabled: true)
       #   # => <input type="text" disabled="disabled" />
       #
+      #   tag("input", type: 'text', class: ["strong", "highlight"])
+      #   # => <input class="strong highlight" type="text" />
+      #
       #   tag("img", src: "open & shut.png")
       #   # => <img src="open &amp; shut.png" />
       #
@@ -75,7 +79,7 @@ module ActionView
       # Set escape to false to disable attribute value escaping.
       #
       # ==== Options
-      # The +options+ hash is used with attributes with no value like (<tt>disabled</tt> and
+      # The +options+ hash can be used with attributes with no value like (<tt>disabled</tt> and
       # <tt>readonly</tt>), which you can give a value of true in the +options+ hash. You can use
       # symbols or strings for the attribute names.
       #
@@ -84,6 +88,8 @@ module ActionView
       #    # => <p>Hello world!</p>
       #   content_tag(:div, content_tag(:p, "Hello world!"), class: "strong")
       #    # => <div class="strong"><p>Hello world!</p></div>
+      #   content_tag(:div, "Hello world!", class: ["strong", "highlight"])
+      #    # => <div class="strong highlight">Hello world!</div>
       #   content_tag("select", options, multiple: true)
       #    # => <select multiple="multiple">...options...</select>
       #