Javadoc: Fix spelling

Author: garydgregory

src/main/javadoc/overview.html

@@ -26,7 +26,7 @@ <h1>
       <img src="org/apache/commons/cli/doc-files/leaf.svg" style="height: 1em; padding-right: 0.25em" alt="leaf">1. Introducing Apache Commons CLI
     </h1>
 
-    <p>The Apacahe Commons CLI component parses command-line arguments for your application.</p>
+    <p>The Apache Commons CLI component parses command-line arguments for your application.</p>
 
     <p>Commons CLI parses command-line arguments using a descriptor of
     valid options (long and short), potentially with arguments.</p>