docs: Spell check fixes (#24217)

**Description:** Spell check fixes for docs, comments, and a couple of
strings. No code change e.g. variable names.
**Issue:** none
**Dependencies:** none
**Twitter handle:** hmartin

libs/core/tests/unit_tests/language_models/chat_models/test_cache.py

@@ -279,7 +279,7 @@ class CustomChat(GenericFakeChatModel):
 async def test_can_swap_caches() -> None:
     """Test that we can use a different cache object.
 
-    This test verifies that when we fetch teh llm_string representation
+    This test verifies that when we fetch the llm_string representation
     of the chat model, we can swap the cache object and still get the same
     result.
     """