bpo-38738: Fix formatting of True and False. (GH-17083)

* "Return true/false" is replaced with "Return ``True``/``False``"
  if the function actually returns a bool.
* Fixed formatting of some True and False literals (now in monospace).
* Replaced "True/False" with "true/false" if it can be not only bool.
* Replaced some 1/0 with True/False if it corresponds the code.
* "Returns <bool>" is replaced with "Return <bool>".
diff --git a/Doc/library/platform.rst b/Doc/library/platform.rst
index e07f9d6..1d33afc 100644
--- a/Doc/library/platform.rst
+++ b/Doc/library/platform.rst
@@ -226,8 +226,8 @@
 
 .. function:: win32_is_iot()
 
-   Returns True if the windows edition returned by win32_edition is recognized
-   as an IoT edition.
+   Return ``True`` if the Windows edition returned by :func:`win32_edition`
+   is recognized as an IoT edition.
 
    .. versionadded:: 3.8