Fix a couple of typos in code comments

Lib/test/string_tests.py

@@ -685,7 +685,7 @@ class BaseTest:
 
 
 class CommonTest(BaseTest):
-    # This testcase contains test that can be used in all
+    # This testcase contains tests that can be used in all
     # stringlike classes. Currently this is str, unicode
     # UserString and the string module.
 

Lib/test/test_zipfile64.py

@@ -3,7 +3,7 @@
 # from test_zipfile
 from test import support
 
-# XXX(nnorwitz): disable this test by looking for extra largfile resource
+# XXX(nnorwitz): disable this test by looking for extralargefile resource,
 # which doesn't exist.  This test takes over 30 minutes to run in general
 # and requires more disk space than most of the buildbots.
 support.requires(

Python/fileutils.c

@@ -599,7 +599,7 @@ _Py_attribute_data_to_stat(BY_HANDLE_FILE_INFORMATION *info, ULONG reparse_tag,
 
    On Windows, use GetFileType() and GetFileInformationByHandle() which support
    files larger than 2 GB.  fstat() may fail with EOVERFLOW on files larger
-   than 2 GB because the file size type is an signed 32-bit integer: see issue
+   than 2 GB because the file size type is a signed 32-bit integer: see issue
    #23152.
 
    On Windows, set the last Windows error and return nonzero on error. On
@@ -669,7 +669,7 @@ _Py_fstat_noraise(int fd, struct _Py_stat_struct *status)
 
    On Windows, use GetFileType() and GetFileInformationByHandle() which support
    files larger than 2 GB.  fstat() may fail with EOVERFLOW on files larger
-   than 2 GB because the file size type is an signed 32-bit integer: see issue
+   than 2 GB because the file size type is a signed 32-bit integer: see issue
    #23152.
 
    Raise an exception and return -1 on error. On Windows, set the last Windows