use error.filename, remove padding and shorten url

src/pip/_internal/commands/install.py

@@ -442,16 +442,14 @@ class InstallCommand(RequirementCommand):
                 error, show_traceback, options.use_user_site,
             )
             if (WINDOWS and error.errno == errno.ENOENT and error.filename and
-                    len(error.filename) >= 260):
+                    len(error.filename) > 260):
                 logger.warning(
                     'The following error can potentially be caused '
                     'because Long Paths is disabled on your system. '
                     'Please set LongPathsEnabled to 1 in the '
                     'registry and try again. For further instructions '
-                    'please refer to the documentation: https://docs.'
-                    'microsoft.com/en-us/windows/win32/fileio/maximum'
-                    '-file-path-limitation?tabs=cmd#enable-long-paths'
-                    '-in-windows-10-version-1607-and-later'
+                    'please refer to the documentation: '
+                    'https://pip.pypa.io/warnings/enable-long-paths'
                 )
             logger.error(message, exc_info=show_traceback)  # noqa