Issue #26778: Fixed "a/an/and" typos in code comment, documentation and error

messages.

Objects/bytearrayobject.c

@@ -3018,7 +3018,7 @@ bytearray(bytes_or_buffer) -> mutable copy of bytes_or_buffer\n\
 bytearray(int) -> bytes array of size given by the parameter initialized with null bytes\n\
 bytearray() -> empty bytes array\n\
 \n\
-Construct an mutable bytearray object from:\n\
+Construct a mutable bytearray object from:\n\
   - an iterable yielding integers in range(256)\n\
   - a text string encoded using the specified encoding\n\
   - a bytes or a buffer object\n\

Objects/rangeobject.c

@@ -5,7 +5,7 @@
 
 /* Support objects whose length is > PY_SSIZE_T_MAX.
 
-   This could be sped up for small PyLongs if they fit in an Py_ssize_t.
+   This could be sped up for small PyLongs if they fit in a Py_ssize_t.
    This only matters on Win64.  Though we could use PY_LONG_LONG which
    would presumably help perf.
 */

Objects/stringlib/unicode_format.h

@@ -1226,7 +1226,7 @@ static PyTypeObject PyFieldNameIter_Type = {
     0};
 
 /* unicode_formatter_field_name_split is used to implement
-   string.Formatter.vformat.  it takes an PEP 3101 "field name", and
+   string.Formatter.vformat.  it takes a PEP 3101 "field name", and
    returns a tuple of (first, rest): "first", the part before the
    first '.' or '['; and "rest", an iterator for the rest of the field
    name.  it's a wrapper around stringlib/string_format.h's