Normalize whitespace.

Update information about the version of Python required -- Python
2.2.2 fixed a bug that seriously affected some Zope installations that
used 2.2.1.

doc/INSTALL.txt

@@ -7,7 +7,7 @@ Building and installing Zope from source
 
 Important notes
 
-   Starting with Zope 2.7, Zope *REQUIRES* Python 2.2.1 or later.
+   Starting with Zope 2.7, Zope *REQUIRES* Python 2.2.2 or later.
    This is done to ease code sharing with Zope 3.
 
    See CHANGES.txt for important notes on this version of Zope.
@@ -18,7 +18,7 @@ Quick Start
   If you are impatient, the following commands should get you up and
   running with Zope 2 using ZServer and ZODB 3 on Unix::
 
-    python w_pcgi.py  # Note, this must be Python 2.2.1 or later
+    python w_pcgi.py  # Note, this must be Python 2.2.2 or later
     ./start
 
   The first command builds and adjusts Zope.  Take note of the user
@@ -73,7 +73,7 @@ Building Zope
 
   Notes
 
-    * You should be using Python 2.2.1 or later to run the build scripts.
+    * You should be using Python 2.2.2 or later to run the build scripts.
 
     * The python you run Zope with *must* have threads compiled in,
       which is the case for a vanilla build.  Warning: Zope will not
@@ -134,5 +134,3 @@ Running Zope
 
   If you wish to enable Zope logging you must specify options on the
   command line.  See LOGGING.txt in the doc directory.
-
-