Add fixes to the docs pages

Author: Martussky

en/_mdb5/standard/web/docs/design-blocks/landing-page/headers/o.html

@@ -84,7 +84,7 @@ <h5 class="mb-0">
   <!--Section: headers 2-->
   <section id="section-headers-2">
     <!-- Section title -->
-    <h2 class="mb-4">Header 2</h2>
+    <h2 class="mb-4">v.2</h2>
 
     <!--Description-->
     <p class="mb-5">
@@ -135,7 +135,7 @@ <h5 class="mb-0">
   <!--Section: headers 3-->
   <section id="section-headers-3">
     <!-- Section title -->
-    <h2 class="mb-4">Header 3</h2>
+    <h2 class="mb-4">v.3</h2>
 
     <!--Description-->
     <p class="mb-5">
@@ -186,7 +186,7 @@ <h5 class="mb-0">
   <!--Section: headers 4-->
   <section id="section-headers-4">
     <!-- Section title -->
-    <h2 class="mb-4">Header 4</h2>
+    <h2 class="mb-4">v.4</h2>
 
     <!--Description-->
     <p class="mb-5">
@@ -237,7 +237,7 @@ <h5 class="mb-0">
   <!--Section: headers 5-->
   <section id="section-headers-5">
     <!-- Section title -->
-    <h2 class="mb-4">Header 5</h2>
+    <h2 class="mb-4">v.5</h2>
 
     <!--Description-->
     <p class="mb-5">