Fix link text.

Author: cfis

index.html

@@ -422,7 +422,7 @@ <h2><a id="reports">Reports</a></h2>
           <dd>Call graphs output results in the calltree profile format which is
             used by KCachegrind. More information about the format can be found
             at the <a href="https://kcachegrind.github.io/html/Home.html">KCachegrind</a>
-            site. An example can be found at <a href="examples/primes.callgrind.out.20124">examples/primes.callgrind.out.2540</a>.
+            site. An example can be found at <a href="examples/primes.callgrind.out.20124">examples/primes.callgrind.out.20124</a>.
           </dd>
           <dt>Graphviz reports (<a href="doc/RubyProf/DotPrinter.html">RubyProf::DotPrinter</a>)</dt>
           <dd>The graphviz report is designed to be opened by <a href="https://www.graphviz.org/">Graphviz