Remove headerDocumentation

core/src/main/java/hudson/Functions.java

@@ -153,9 +153,6 @@
 import jenkins.model.ModelObjectWithContextMenu;
 import jenkins.model.SimplePageDecorator;
 import jenkins.util.SystemProperties;
-import jenkins.views.Header;
-import jenkins.views.JenkinsHeader;
-
 import org.apache.commons.jelly.JellyContext;
 import org.apache.commons.jelly.JellyTagException;
 import org.apache.commons.jelly.Script;

core/src/main/resources/lib/layout/pageHeader.jelly

@@ -1,7 +1,31 @@
 <?jelly escape-by-default='true'?>
 <j:jelly xmlns:j="jelly:core" xmlns:st="jelly:stapler" xmlns:d="jelly:define" xmlns:l="/lib/layout" xmlns:i="jelly:fmt" xmlns:x="jelly:xml">
+	<st:documentation>
+        Generates the page header, along with its associated dynamic behaviours.
+        This tag is used by l:layout and not expected to be used by anyone else,
+        but it's written as separate tag for better readability of code.
+
+        <st:attribute name="title" required="true">
+            Page title and title attribute for the logo
+        </st:attribute>
+
+        <st:attribute name="logoAlt" required="true">
+            Alt text for the logo
+        </st:attribute>
+
+        <st:attribute name="searchPlaceholder" required="true">
+            Placeholder text for the search input
+        </st:attribute>
+
+        <st:attribute name="searchHelpUrl" required="true">
+            Link value for the help icon on the search box
+        </st:attribute>
+
+        <st:attribute name="logout" required="true">
+            Text for the logout link
+        </st:attribute>
+    </st:documentation>
 	<j:invokeStatic var="header" className="jenkins.views.JenkinsHeader" method="get"/>
-	<st:include it="${header}" page="headerDocumentation.jelly"/>
 	<st:include it="${header}" page="preHeader.jelly"/>
 	<st:include it="${header}" page="headerContent.jelly"/>
 	<st:include it="${header}" page="postHeader.jelly"/>