Make icon blue and shorten text to "Contribute to the docs"

Co-authored-by: theletterf <[email protected]>

Author: Copilot

src/Elastic.Markdown/Layout/_TableOfContents.cshtml

@@ -37,9 +37,9 @@
 			<li class="learn-how-to-contribute hidden lg:block lg:not-first:mt-1">
 				<a href="https://www.elastic.co/docs/contribute-docs/" class="link text-sm" target="_blank">
 					<svg class="link-icon" xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16">
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+						<path fill="currentColor" d="M8.8,0 C9.074,0 9.337,0.113 9.526,0.312 L12.726,3.74 C12.902,3.926 13,4.173 13,4.429 L13,13 C13,13.552 12.552,14 12,14 L2,14 C1.448,14 1,13.552 1,13 L1,1 C1,0.448 1.448,0 2,0 L8.8,0 Z M12,5 L8.5,5 C8.224,5 8,4.776 8,4.5 L8,1 L2,1 L2,13 L12,13 L12,5 Z M4.5,11 C4.22385763,11 4,10.7761424 4,10.5 C4,10.2238576 4.22385763,10 4.5,10 L9.5,10 C9.7761424,10 10,10.2238576 10,10.5 C10,10.7761424 9.7761424,11 9.5,11 L4.5,11 Z M4.5,8 C4.22385763,8 4,7.77614237 4,7.5 C4,7.22385763 4.22385763,7 4.5,7 L9.5,7 C9.7761424,7 10,7.22385763 10,7.5 C10,7.77614237 9.7761424,8 9.5,8 L4.5,8 Z M5.5,16 C5.22385763,16 5,15.7761424 5,15.5 C5,15.2238576 5.22385763,15 5.5,15 L14,15 L14,6.5 C14,6.22385763 14.2238576,6 14.5,6 C14.7761424,6 15,6.22385763 15,6.5 L15,15 C15,15.5522847 14.5522847,16 14,16 L5.5,16 Z"/>
 					</svg>
-					Learn how to contribute
+					Contribute to the docs
 				</a>
 			</li>
 		</ul>