apply a couple more review comments

peps/pep-0733.rst

@@ -116,8 +116,8 @@ describes this complex state of affairs in terms of the
 actions that different stakeholders need to perform through
 the C API.
 
-Universal Actions for All Stakeholders
---------------------------------------
+Common Actions for All Stakeholders
+-----------------------------------
 
 There are actions which are generic, and required by
 all types of API users:
@@ -129,17 +129,16 @@ all types of API users:
 * Introspect objects, including types, instances, and functions
 * Raise and handle exceptions
 * Import modules
-* Manage threads
 * Manage sub-interpreters
-* Handle and send signals
+* Access to Python's OS interface
 
 The following sections look at the unique requirements of various stakeholders.
 
 Extension Writers
 -----------------
 
 Extension writers are the traditional users of the C API. Their requirements
-are the universal actions listed above.
+are the common actions listed above.
 
 Authors of Embedded Python Applications
 ---------------------------------------