Trac #33213: remove mentions of SAGE_TMP from the lazy_string module.

src/sage/misc/lazy_string.pyx

@@ -7,12 +7,7 @@ Based on speaklater: https://github.com/mitsuhiko/speaklater.
 A lazy string is an object that behaves almost exactly like a string
 but where the value is not computed until needed.  To define a lazy
 string you specify a function that produces a string together with the
-appropriate arguments for that function.  Sage uses lazy strings in
-:mod:`sage.misc.misc` so that the filenames for SAGE_TMP (which
-depends on the pid of the process running Sage) are not computed when
-importing the Sage library.  This means that when the doctesting code
-imports the Sage library and then forks, the variable SAGE_TMP depends
-on the new pid rather than the old one.
+appropriate arguments for that function.
 
 EXAMPLES::
 
@@ -321,12 +316,6 @@ cdef class _LazyString(object):
         This is for Python 3 compatibility: see :trac:`24046`, and also
         :pep:`519` and
         https://docs.python.org/3/library/os.html#os.fspath
-
-        Test :trac:`24046`::
-
-            sage: from sage.misc.misc import SAGE_TMP
-            sage: tmp = os.path.join(SAGE_TMP, 'hello')
-            sage: _ = os.path.exists(tmp)
         """
         return str(self)