Change link text for reporting issues (#2146)

`Report an issue` mislead folks into thinking this is for any issues, so should be more specific

Author: leemthompo

src/Elastic.Markdown/Layout/_TableOfContents.cshtml

@@ -20,7 +20,7 @@
 					<svg class="link-icon" viewBox="0 0 98 96" xmlns="http://www.w3.org/2000/svg">
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-					Report an issue
+					Report a docs issue
 				</a>
 			</li>
 			@if (!string.IsNullOrEmpty(Model.GithubEditUrl))