Issue #25523: Correct "a" article to "an" article
This changes the main documentation, doc strings, source code comments, and a
couple error messages in the test suite. In some cases the word was removed
or edited some other way to fix the grammar.
diff --git a/Doc/library/http.cookiejar.rst b/Doc/library/http.cookiejar.rst
index 30648ac..ca68aac 100644
--- a/Doc/library/http.cookiejar.rst
+++ b/Doc/library/http.cookiejar.rst
@@ -176,7 +176,7 @@
The *response* object (usually the result of a call to
:meth:`urllib.request.urlopen`, or similar) should support an :meth:`info`
- method, which returns a :class:`email.message.Message` instance.
+ method, which returns an :class:`email.message.Message` instance.
The *request* object (usually a :class:`urllib.request.Request` instance)
must support the methods :meth:`get_full_url`, :meth:`get_host`,