Adjust table columns width

Author: Robert Kratky

asciidoc-markup-sample-doc/asciidoc-markup-samples.adoc

@@ -11,7 +11,7 @@
 Some markup examples used in this overview are based on new Asciidoctor features and they are not a part of the standard set of elements. Please, use the `:experimental:` tag in the header of your document to enable this functionality.
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-[cols="2,4,4"]
+[cols="3,4,4"]
 |===
 |Element|Mark-up|Example rendered output