don't remove self from example code in the HTML output (closes #13223)

Patch by Víctor Terrón.
diff --git a/Lib/test/test_pydoc.py b/Lib/test/test_pydoc.py
index 5c62f68..7ff8d6d 100644
--- a/Lib/test/test_pydoc.py
+++ b/Lib/test/test_pydoc.py
@@ -38,6 +38,7 @@
 CLASSES
     __builtin__.object
         B
+        C
     A
 \x20\x20\x20\x20
     class A
@@ -59,6 +60,26 @@
      |  Data and other attributes defined here:
      |\x20\x20
      |  NO_MEANING = 'eggs'
+\x20\x20\x20\x20
+    class C(__builtin__.object)
+     |  Methods defined here:
+     |\x20\x20
+     |  get_answer(self)
+     |      Return say_no()
+     |\x20\x20
+     |  is_it_true(self)
+     |      Return self.get_answer()
+     |\x20\x20
+     |  say_no(self)
+     |\x20\x20
+     |  ----------------------------------------------------------------------
+     |  Data descriptors defined here:
+     |\x20\x20
+     |  __dict__
+     |      dictionary for instance variables (if defined)
+     |\x20\x20
+     |  __weakref__
+     |      list of weak references to the object (if defined)
 
 FUNCTIONS
     doc_func()
@@ -108,6 +129,7 @@
 </font></dt><dd>
 <dl>
 <dt><font face="helvetica, arial"><a href="test.pydoc_mod.html#B">B</a>
+</font></dt><dt><font face="helvetica, arial"><a href="test.pydoc_mod.html#C">C</a>
 </font></dt></dl>
 </dd>
 <dt><font face="helvetica, arial"><a href="test.pydoc_mod.html#A">A</a>
@@ -142,6 +164,28 @@
 Data and other attributes defined here:<br>
 <dl><dt><strong>NO_MEANING</strong> = 'eggs'</dl>
 
+</td></tr></table> <p>
+<table width="100%%" cellspacing=0 cellpadding=2 border=0 summary="section">
+<tr bgcolor="#ffc8d8">
+<td colspan=3 valign=bottom>&nbsp;<br>
+<font color="#000000" face="helvetica, arial"><a name="C">class <strong>C</strong></a>(<a href="__builtin__.html#object">__builtin__.object</a>)</font></td></tr>
+\x20\x20\x20\x20
+<tr><td bgcolor="#ffc8d8"><tt>&nbsp;&nbsp;&nbsp;</tt></td><td>&nbsp;</td>
+<td width="100%%">Methods defined here:<br>
+<dl><dt><a name="C-get_answer"><strong>get_answer</strong></a>(self)</dt><dd><tt>Return&nbsp;<a href="#C-say_no">say_no</a>()</tt></dd></dl>
+
+<dl><dt><a name="C-is_it_true"><strong>is_it_true</strong></a>(self)</dt><dd><tt>Return&nbsp;self.<a href="#C-get_answer">get_answer</a>()</tt></dd></dl>
+
+<dl><dt><a name="C-say_no"><strong>say_no</strong></a>(self)</dt></dl>
+
+<hr>
+Data descriptors defined here:<br>
+<dl><dt><strong>__dict__</strong></dt>
+<dd><tt>dictionary&nbsp;for&nbsp;instance&nbsp;variables&nbsp;(if&nbsp;defined)</tt></dd>
+</dl>
+<dl><dt><strong>__weakref__</strong></dt>
+<dd><tt>list&nbsp;of&nbsp;weak&nbsp;references&nbsp;to&nbsp;the&nbsp;object&nbsp;(if&nbsp;defined)</tt></dd>
+</dl>
 </td></tr></table></td></tr></table><p>
 <table width="100%%" cellspacing=0 cellpadding=2 border=0 summary="section">
 <tr bgcolor="#eeaa77">