MAINT: updated instructions to get MachAr byte pattern (numpy#26415)

* MAINT: updated instructions to get MachAr byte pattern

Author: andyfaff

numpy/_core/getlimits.py

@@ -146,10 +146,12 @@ def _float_to_str(self, value):
         title = _title_fmt.format('half'))}
 
 # Key to identify the floating point type.  Key is result of
-# ftype('-0.1').newbyteorder('<').tobytes()
 #
-# 20230201 - use (ftype(-1.0) / ftype(10.0)).newbyteorder('<').tobytes()
-#            instead because stold may have deficiencies on some platforms.
+#    ftype = np.longdouble        # or float64, float32, etc.
+#    v = (ftype(-1.0) / ftype(10.0))
+#    v.view(v.dtype.newbyteorder('<')).tobytes()
+#
+# Uses division to work around deficiencies in strtold on some platforms.
 # See:
 # https://perl5.git.perl.org/perl.git/blob/3118d7d684b56cbeb702af874f4326683c45f045:/Configure