bpo-32746: Fix multiple typos (GH-5144)

Fix typos found by codespell in docs, docstrings, and comments.

Modules/_asynciomodule.c

@@ -187,7 +187,7 @@ is_coroutine(PyObject *coro)
         return _is_coroutine(coro);
     }
 
-    /* either an error has occured or
+    /* either an error has occurred or
        type(coro) is in iscoroutine_typecache
     */
     return has_it;

Modules/_datetimemodule.c

@@ -3420,7 +3420,7 @@ Inconsistent:
     PyErr_SetString(PyExc_ValueError, "fromutc: tz.dst() gave"
                     "inconsistent results; cannot convert");
 
-    /* fall thru to failure */
+    /* fall through to failure */
 Fail:
     Py_XDECREF(off);
     Py_XDECREF(dst);

Modules/_hashopenssl.c

@@ -962,7 +962,7 @@ generate_hash_name_list(void)
  *  This macro generates constructor function definitions for specific
  *  hash algorithms.  These constructors are much faster than calling
  *  the generic one passing it a python string and are noticeably
- *  faster than calling a python new() wrapper.  Thats important for
+ *  faster than calling a python new() wrapper.  That is important for
  *  code that wants to make hashes of a bunch of small strings.
  *  The first call will lazy-initialize, which reports an exception
  *  if initialization fails.

Modules/_pickle.c

@@ -1015,7 +1015,7 @@ _Pickler_OpcodeBoundary(PicklerObject *self)
         if(_Pickler_CommitFrame(self)) {
             return -1;
         }
-        /* Flush the content of the commited frame to the underlying
+        /* Flush the content of the committed frame to the underlying
          * file and reuse the pickler buffer for the next frame so as
          * to limit memory usage when dumping large complex objects to
          * a file.

Modules/md5module.c

@@ -293,7 +293,7 @@ md5_done(struct md5_state *md5, unsigned char *out)
         md5->curlen = 0;
     }
 
-    /* pad upto 56 bytes of zeroes */
+    /* pad up to 56 bytes of zeroes */
     while (md5->curlen < 56) {
         md5->buf[md5->curlen++] = (unsigned char)0;
     }

Modules/socketmodule.c

@@ -6156,7 +6156,7 @@ socket_getaddrinfo(PyObject *self, PyObject *args, PyObject* kwargs)
     }
 #if defined(__APPLE__) && defined(AI_NUMERICSERV)
     if ((flags & AI_NUMERICSERV) && (pptr == NULL || (pptr[0] == '0' && pptr[1] == 0))) {
-        /* On OSX upto at least OSX 10.8 getaddrinfo crashes
+        /* On OSX up to at least OSX 10.8 getaddrinfo crashes
          * if AI_NUMERICSERV is set and the servname is NULL or "0".
          * This workaround avoids a segfault in libsystem.
          */