More of Rob W. W. Hooft's spelling fixes. The only ones left now are the
distutils patches, which I'll leave to the distutils maintainers.

Tip: review the patch like this:

grep "^[\!+-] " <patchfile>

To get a quick and easy way to review the actual changes. Most of the
changes are single-line ones, anyway.
diff --git a/Doc/ref/ref1.tex b/Doc/ref/ref1.tex
index c35f157..37fbad7 100644
--- a/Doc/ref/ref1.tex
+++ b/Doc/ref/ref1.tex
@@ -13,7 +13,7 @@
 On the other hand, if you are using
 Python and wonder what the precise rules about a particular area of
 the language are, you should definitely be able to find them here.
-If you would like to see a more formal definitition of the language,
+If you would like to see a more formal definition of the language,
 maybe you could volunteer your time --- or invent a cloning machine
 :-).