Improve --with-address-sanitizer and pymalloc docs

Author: disconnect3d

Doc/c-api/memory.rst

@@ -673,10 +673,8 @@ This allocator is disabled if Python is configured with the
 the :envvar:`PYTHONMALLOC` environment variable (ex: ``PYTHONMALLOC=malloc``).
 
 Typically, it makes sense to disable the pymalloc allocator when building
-Python with AddressSanitizer (ASan) which helps uncover low level bugs within
-the C code. While pymalloc doesn't break under ASan, the ASan works more
-effectively with the system allocator (ASan does not track
-individual allocations done by pymalloc).
+Python with AddressSanitizer (:option:`--with-address-sanitizer`) which helps
+uncover low level bugs within the C code.
 
 Customize pymalloc Arena Allocator
 ----------------------------------

Doc/using/configure.rst

@@ -802,6 +802,9 @@ Debug options
 .. option:: --with-address-sanitizer
 
    Enable AddressSanitizer memory error detector, ``asan`` (default is no).
+   To improve ASan detection capabilities you may also want to combine this
+   with :option:`--without-pymalloc` to disable the specialized small-object
+   allocator whose allocations are not tracked by ASan.
 
    .. versionadded:: 3.6