Implement suggestion from code review (avoid empty function body in the code examples)

Author: rodrigoprimo

src/Standards/Generic/Docs/Functions/OpeningFunctionBraceKernighanRitchieStandard.xml

@@ -9,13 +9,15 @@
         <code title="Valid: Opening brace on the same line.">
         <![CDATA[
 function fooFunction($arg1, $arg2 = '')<em> {</em>
+    // Do something.
 }
         ]]>
         </code>
         <code title="Invalid: Opening brace on the next line.">
         <![CDATA[
 function fooFunction($arg1, $arg2 = '')
 <em>{</em>
+    // Do something.
 }
         ]]>
         </code>