Changed example as 3-column-double-footer

Author: ajithkumar-maragathavel

src/guides/v2.3/frontend-dev-guide/layouts/layout-create.md

@@ -7,15 +7,17 @@ functional_areas:
 
 ### Create a new page layout in custom theme
 
-create a custom page-layout xml file in the below directory.
-app/design/frontend/<VendorName>/<ThemeName>/Magento_Theme/page_layout/4columns.xml
+If an existing page layout doesn't meet your requirements, then you can create a new page layout in Magento.
+
+For example, If a new page is going to be designed in `3-columns-double-footer` layout, you may create the new layout in the following way. Create a custom page-layout xml file in the below directory.
+app/design/frontend/<VendorName>/<ThemeName>/Magento_Theme/page_layout/3-columns-double-footer.xml
 
 ```xml
 <?xml version="1.0"?>
 <layout xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_layout.xsd">
     <update handle="3columns"/>
     <referenceContainer name="page.wrapper">
-        <container name="header.container" as="header_container" label="Page Header Container" htmlTag="header" htmlClass="page-header" before="main.content"/>
+        <container name="footer-bottom" as="footer-bottom" after="-" label="Footer Bottom" htmlTag="footer" htmlClass="page-footer-bottom"/>
     </referenceContainer>
 </layout>
 ```
@@ -29,8 +31,8 @@ app/design/frontend/<VendorName>/<ThemeName>/Magento_Theme/layouts.xml
 <?xml version="1.0" encoding="UTF-8"?>
 
 <page_layouts xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/PageLayout/etc/layouts.xsd">
-    <layout id="4columns">
-        <label translate="true">4 columns</label>
+    <layout id="3-columns-double-footer">
+        <label translate="true">3 Columns Double Footer</label>
     </layout>
 </page_layouts>
 ```