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.

1 files changed, 1 insertions, 1 deletions

diff --git a/Doc/faq/programming.rst b/Doc/faq/programming.rst
index 67a9c56..295445e 100644
--- a/Doc/faq/programming.rst
+++ b/Doc/faq/programming.rst
@@ -849,7 +849,7 @@ How do I modify a string in place?
 You can't, because strings are immutable.  In most situations, you should
 simply construct a new string from the various parts you want to assemble
 it from.  However, if you need an object with the ability to modify in-place
-unicode data, try using a :class:`io.StringIO` object or the :mod:`array`
+unicode data, try using an :class:`io.StringIO` object or the :mod:`array`
 module::
 
    >>> import io