Fix #1976: documentation corrections + remove duplicate navigation block

Author: Anuj Agarwal

components/DocsHelp.tsx

@@ -168,7 +168,7 @@ export function DocsHelp({
       data-test='docs-help'
     >
       <h2 className='text-[24px] font-semibold' data-test='need-help-heading'>
-        Need Help?
+        Need help?
       </h2>
 
       <div className='grid grid-cols-1 sm:grid-cols-2 md:grid-cols-3 gap-8 pt-10 border-t border-gray-600'>
@@ -361,7 +361,7 @@ export function DocsHelp({
                   <Icon>
                     <path d='M1.5 3.25a2.25 2.25 0 1 1 3 2.122v5.256a2.251 2.251 0 1 1-1.5 0V5.372A2.25 2.25 0 0 1 1.5 3.25Zm5.677-.177L9.573.677A.25.25 0 0 1 10 .854V2.5h1A2.5 2.5 0 0 1 13.5 5v5.628a2.251 2.251 0 1 1-1.5 0V5a1 1 0 0 0-1-1h-1v1.646a.25.25 0 0 1-.427.177L7.177 3.427a.25.25 0 0 1 0-.354ZM3.75 2.5a.75.75 0 1 0 0 1.5.75.75 0 0 0 0-1.5Zm0 9.5a.75.75 0 1 0 0 1.5.75.75 0 0 0 0-1.5Zm8.25.75a.75.75 0 1 0 1.5 0 .75.75 0 0 0-1.5 0Z' />
                   </Icon>
-                  Edit this page on Github
+                  Edit this page on GitHub
                 </a>
               </Button>
             </div>
@@ -395,7 +395,7 @@ export function DocsHelp({
           <div className='my-6 text-[14px]'>
             <p data-test='additional-help-description'>
               Learning JSON Schema is often confusing, but don't worry, we are
-              here to help!.
+              here to help!
             </p>
           </div>