RHIDP-6970: Fix headings in Customizing doc (#1071)

Author: linfraze

Diff for: assemblies/assembly-customizing-the-appearance.adoc

@@ -51,4 +51,3 @@ include::modules/customizing-the-appearance/ref-customize-rhdh-default-backstage
 include::modules/customizing-the-appearance/proc-loading-custom-theme-using-dynamic-plugin.adoc[leveloffset=+1]
 
 include::modules/customizing-the-appearance/ref-customize-rhdh-custom-components.adoc[leveloffset=+1]
-

Diff for: modules/customizing-the-appearance/proc-customize-rhdh-sidebar-menuitems.adoc

@@ -11,8 +11,6 @@ Main menu items:: The core navigation structure of sidebar is static.
 .Procedure
 
 . Customize the main menu items using the following steps:
-+
---
 .. Open the `{my-app-config-file}` file.
 .. To customize the order and parent-child relationships for the main menu items, use the `dynamicPlugins.frontend.default.main-menu-items.menuItems` field.
 .. For dynamic plugin menu items, use the `dynamicPlugins.frontend.<package_name>.menuItems` field.
@@ -28,7 +26,7 @@ dynamicPlugins:
             title: Home
             icon: home
             priority: 100
-          default.my-group: 
+          default.my-group:
             title: My Group
             icon: group
             priority: 90
@@ -115,7 +113,7 @@ dynamicPlugins:
 
 
 . To modify a main menu item or add a custom menu item, add a section to the `default.main-menu-items` > `menuItems` section in your `{my-app-config-file}` file. Use the `default.` prefix to identify the key as a main menu item.
-+ 
++
 [source,yaml]
 ----
 dynamicPlugins:
@@ -153,12 +151,12 @@ default.main-menu-items:
       menuItems:
         default.catalog:
           icon: category # <1>
-          title: My Catalog 
+          title: My Catalog
           priority: 5
-        default.learning-path: 
-          title: '' # <2> to hide the learning path from default sidebar
+        default.learning-path:
+          title: '' # <2>
         default.parentlist: # <3>
-          title: Overview 
+          title: Overview
           icon: bookmarks
         default.home:
           parent: default.parentlist # <4>
@@ -173,4 +171,4 @@ default.main-menu-items:
 <4> `parent`: Nests home menu under the `default.parentlist` parent menu item.
 <5> `title`: Specifies a name for `default.references`
 <6> `icon`: Displays the `school` icon.
-<7> `to`: Redirects `default.references` to the `/references` page.
+<7> `to`: Redirects `default.references` to the `/references` page.

Diff for: titles/customizing/master.adoc

@@ -37,4 +37,3 @@ include::assemblies/assembly-customizing-the-homepage.adoc[leveloffset=+1]
 
 
 include::assemblies/assembly-customizing-the-quick-access-card.adoc[leveloffset=+1]
-