Fix: Typo and clarity of automatic offset example

- Thanks sshelzi

Author: AllanJard

examples/options/offset-automatic.xml

@@ -4,6 +4,10 @@
 <css lib="datatables fixedheader" />
 <js lib="jquery datatables fixedheader">
 <![CDATA[
+// Note although the initialisation here is identical to the basic FixedHeader case
+// There is a fixed position element which has a class of `fh-fixedHeader` which
+// FixedHeader will automatically detect. See the description above.
+
 $(document).ready(function() {
 	$('#example').DataTable( {
 		fixedHeader: true
@@ -21,7 +25,7 @@ It is not uncommon to have a fixed element at the top or bottom of a web-page to
 * Automatically, by assigning the class `-string fh-fixedHeader` or `-string fh-fixedFooter` to the fixed elements
 * Using the `fh-init fixedHeader.headerOffset` and `fh-init fixedHeader.footerOffset` options.
 
-This example demonstrates the first option where a header element has the class `-string fh-fixedHeader` assigned to it. FixedHeader automatically detects this element and will offer the header by the required amount.
+This example demonstrates the first option where a header element has the class `-string fh-fixedHeader` assigned to it. FixedHeader automatically detects this element and will offset the header by the required amount.
 
 <div class="fh-fixedHeader" style="position:fixed; background-color:#4E6CA3; top:0; right:0; left:0; height:50px; z-index:1;"> </div>