[3.15] Fix typos in the concurrent.interpreters docs (GH-156485) (#156790)

Fix typos in the `concurrent.interpreters` docs (GH-156485)
(cherry picked from commit 76fefef)

Co-authored-by: grayjk <2437532+grayjk@users.noreply.github.com>

Author: miss-islington

Doc/library/concurrent.interpreters.rst

@@ -191,7 +191,7 @@ objects are either directly shared or copied efficiently.  For example:
 * :class:`float`
 * :class:`tuple` (of similarly supported objects)
 
-There is a small number of Python types that actually share mutable
+There are a small number of Python types that actually share mutable
 data between interpreters:
 
 * :class:`memoryview`
@@ -274,7 +274,7 @@ Interpreter objects
 
    .. method:: call(callable, /, *args, **kwargs)
 
-      Return the result of calling running the given function in the
+      Return the result of running the given function in the
       interpreter (in the current thread).
 
    .. _interp-call-in-thread: