Correct “an” → “a” with “Unicode”, “user”, “UTF”, etc
This affects documentation and code comments.
diff --git a/Doc/library/xml.sax.reader.rst b/Doc/library/xml.sax.reader.rst
index 6956cd1..7270153 100644
--- a/Doc/library/xml.sax.reader.rst
+++ b/Doc/library/xml.sax.reader.rst
@@ -101,7 +101,7 @@
Process an input source, producing SAX events. The *source* object can be a
system identifier (a string identifying the input source -- typically a file
- name or an URL), a file-like object, or an :class:`InputSource` object. When
+ name or a URL), a file-like object, or an :class:`InputSource` object. When
:meth:`parse` returns, the input is completely processed, and the parser object
can be discarded or reset. As a limitation, the current implementation only
accepts byte streams; processing of character streams is for further study.