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/library/difflib.rst b/Doc/library/difflib.rst
index 6092582..cead818 100644
--- a/Doc/library/difflib.rst
+++ b/Doc/library/difflib.rst
@@ -269,7 +269,7 @@ diffs. For comparing directories and files, see also, the :mod:`filecmp` module.
    generating the delta lines) in unified diff format.
 
    Unified diffs are a compact way of showing just the lines that have changed plus
-   a few lines of context.  The changes are shown in a inline style (instead of
+   a few lines of context.  The changes are shown in an inline style (instead of
    separate before/after blocks).  The number of context lines is set by *n* which
    defaults to three.