Fix mismatched function name between code and text in Chapter 8

Author: marijnh

08_error.md

@@ -371,11 +371,10 @@ to report to the user what went wrong and then give up. But in either
 situation, the program has to actively do something in response to the
 problem.
 
-{{index "promptInteger function", validation}}
+{{index "promptNumber function", validation}}
 
-Say you have a function `promptInteger` that asks the user for a whole
-number and returns it. What should it return if the user inputs
-"orange"?
+Say you have a function `promptNumber` that asks the user for a number
+and returns it. What should it return if the user inputs "orange"?
 
 {{index null, undefined, "return value", "special return value"}}
 

html/errata.html

@@ -36,6 +36,14 @@ <h2>Chapter 6</h2>
 paragraph below the example code, instead of “<code>content</code>
 method”, the text should say “<code>element</code> function”.
 
+<h2>Chapter 8</h2>
+
+<p><strong>Page 134</strong> <em>Error Propagation</em>: In the third
+paragraph of the section, a function <code>promptInteger</code> is
+referred to. The function is actually
+called <code>promptNumber</code>, and the word “whole” should be
+dropped from the sentence (it accepts non-whole numbers, too).</p>
+
 <h2>Chapter 10</h2>
 
 <p><strong>Page 168</strong> (1st) <em>Modules as Building Blocks</em>: In “each