Correct “an” → “a” with “Unicode”, “user”, “UTF”, etc
This affects documentation and code comments.
diff --git a/Doc/library/xml.etree.elementtree.rst b/Doc/library/xml.etree.elementtree.rst
index 212a9e1..b588598 100644
--- a/Doc/library/xml.etree.elementtree.rst
+++ b/Doc/library/xml.etree.elementtree.rst
@@ -901,7 +901,7 @@
to get proper namespace handling on output. *text_or_uri* is a string
containing the QName value, in the form {uri}local, or, if the tag argument
is given, the URI part of a QName. If *tag* is given, the first argument is
- interpreted as an URI, and this argument is interpreted as a local name.
+ interpreted as a URI, and this argument is interpreted as a local name.
:class:`QName` instances are opaque.