Add a note about which tarball to use for Python

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@11573 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

chapter05/python.xml

@@ -43,6 +43,13 @@
   <sect2 role="installation">
     <title>Installation of Python</title>
 
+    <note>
+      <para>There are two package files whose name starts with
+      <quote>python</quote>. The one to extract from is
+      <filename>Python-&python-version;.tar.xz</filename> (notice the
+      uppercase first letter).</para>
+    </note>
+
     <para>This package first builds the Python interpreter, then some
     standard Python modules. The main script for building modules is
     written in Python, and uses hard-coded paths to the host <filename