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.

2 files changed, 3 insertions, 3 deletions

diff --git a/Include/abstract.h b/Include/abstract.h
index 6e850b8..bbedafd 100644
--- a/Include/abstract.h
+++ b/Include/abstract.h
@@ -95,7 +95,7 @@ Proposal
   numeric, sequence, and mapping.  Each protocol consists of a
   collection of related operations.  If an operation that is not
   provided by a particular type is invoked, then a standard exception,
-  NotImplementedError is raised with a operation name as an argument.
+  NotImplementedError is raised with an operation name as an argument.
   In addition, for convenience this interface defines a set of
   constructors for building objects of built-in types.  This is needed
   so new objects can be returned from C functions that otherwise treat
diff --git a/Include/codecs.h b/Include/codecs.h
index b3088e4..dfcfa9c 100644
--- a/Include/codecs.h
+++ b/Include/codecs.h
@@ -165,14 +165,14 @@ PyAPI_FUNC(PyObject *) PyCodec_Decoder(
        const char *encoding
        );
 
-/* Get a IncrementalEncoder object for the given encoding. */
+/* Get an IncrementalEncoder object for the given encoding. */
 
 PyAPI_FUNC(PyObject *) PyCodec_IncrementalEncoder(
        const char *encoding,
        const char *errors
        );
 
-/* Get a IncrementalDecoder object function for the given encoding. */
+/* Get an IncrementalDecoder object function for the given encoding. */
 
 PyAPI_FUNC(PyObject *) PyCodec_IncrementalDecoder(
        const char *encoding,