Fix typos in C API documentation (GH-149588)

Doc/c-api/slots.rst

diff --git a/Doc/c-api/slots.rst b/Doc/c-api/slots.rst
index b61c2f2..84a125c 100644
--- a/Doc/c-api/slots.rst
+++ b/Doc/c-api/slots.rst
@@ -7,10 +7,10 @@
 
 To define :ref:`module objects <moduleobjects>` and
 :ref:`classes <creating-heap-types>` using the C API, you may use
-an array of *slots* -- essentally, key-value pairs that describe features
+an array of *slots* -- essentially, key-value pairs that describe features
 of the object to create.
 This decouples the data from the structures used at runtime, allowing CPython
--- and other Python C API implementations -- to update the stuctures without
+-- and other Python C API implementations -- to update the structures without
 breaking backwards compatibility.
 
 This section documents slots in general.

Doc/c-api/synchronization.rst

diff --git a/Doc/c-api/synchronization.rst b/Doc/c-api/synchronization.rst
index 7e9894f..6f18c04 100644
--- a/Doc/c-api/synchronization.rst
+++ b/Doc/c-api/synchronization.rst
@@ -238,7 +238,7 @@
 .. c:function:: void PyCriticalSection_BeginMutex(PyCriticalSection *c, PyMutex *m);
                 void PyCriticalSection2_BeginMutex(PyCriticalSection2 *c, PyMutex *m1, PyMutex *m2);
 
-   .. (These need to be in a separate section without a Stable ABI anotation.)
+   .. (These need to be in a separate section without a Stable ABI annotation.)
 
    To be used only as in the macro expansions
    listed :ref:`earlier in this section <critical-section-macros>`.