added idx tag

Author: habibasorour

source/ch5_loopsanditeration.ptx

@@ -11,6 +11,7 @@
         </p>
 
         <p><idx><c>for</c> loop</idx>
+            <idx>definite loop</idx> 
             A <term>definite loop</term> is a loop that is executed a specific or definite number of times. In Python, the easiest way to write a definite loop is using the <c>for</c> loop in conjunction with the <c>range</c> function. <xref ref="python-range-options" text="type-global"/> shows the syntax for the <c>range</c> function.
         </p>
         <listing xml:id="python-definite-loop">